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Date: Fri, 8 May 2015 12:12:35 -0700
From: "Darrick J. Wong" <darrick.wong@...cle.com>
To: tytso@....edu
Cc: linux-ext4@...r.kernel.org
Subject: [PATCH] misc: clean up undo file setup
Fix Coverity bugs 1297094-1297101 by fixing all the mutations in the
*_setup_tdb() functions, fixing buffer overflows, and checking
return values.
Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
debugfs/debugfs.c | 29 ++++++++++++------------
e2fsck/unix.c | 16 +++++++++++--
misc/e2undo.c | 64 +++++++++++++++++++++++++++++++++--------------------
misc/mke2fs.c | 12 +++++++---
misc/tune2fs.c | 63 +++++++++++++++++++++++++++++-----------------------
resize/main.c | 29 ++++++++++++------------
6 files changed, 125 insertions(+), 88 deletions(-)
diff --git a/debugfs/debugfs.c b/debugfs/debugfs.c
index 2af6b71..40ec05f 100644
--- a/debugfs/debugfs.c
+++ b/debugfs/debugfs.c
@@ -55,11 +55,12 @@ static int debugfs_setup_tdb(const char *device_name, char *undo_file,
errcode_t retval = ENOMEM;
char *tdb_dir = NULL, *tdb_file = NULL;
char *dev_name, *tmp_name;
- int free_tdb_dir = 0;
/* (re)open a specific undo file */
if (undo_file && undo_file[0] != 0) {
- set_undo_io_backing_manager(*io_ptr);
+ retval = set_undo_io_backing_manager(*io_ptr);
+ if (retval)
+ goto err;
*io_ptr = undo_io_manager;
retval = set_undo_io_backup_file(undo_file);
if (retval)
@@ -68,7 +69,7 @@ static int debugfs_setup_tdb(const char *device_name, char *undo_file,
"using the command:\n"
" e2undo %s %s\n\n",
undo_file, device_name);
- return 0;
+ return retval;
}
/*
@@ -76,19 +77,18 @@ static int debugfs_setup_tdb(const char *device_name, char *undo_file,
* nice
*/
tdb_dir = getenv("E2FSPROGS_UNDO_DIR");
+ if (!tdb_dir)
+ tdb_dir = "/var/lib/e2fsprogs";
- if (tdb_dir == NULL || !strcmp(tdb_dir, "none") || (tdb_dir[0] == 0) ||
- access(tdb_dir, W_OK)) {
- if (free_tdb_dir)
- free(tdb_dir);
+ if (!strcmp(tdb_dir, "none") || (tdb_dir[0] == 0) ||
+ access(tdb_dir, W_OK))
return 0;
- }
tmp_name = strdup(device_name);
if (!tmp_name)
goto errout;
dev_name = basename(tmp_name);
- tdb_file = malloc(strlen(tdb_dir) + 8 + strlen(dev_name) + 7 + 1);
+ tdb_file = malloc(strlen(tdb_dir) + 9 + strlen(dev_name) + 7 + 1);
if (!tdb_file) {
free(tmp_name);
goto errout;
@@ -98,10 +98,14 @@ static int debugfs_setup_tdb(const char *device_name, char *undo_file,
if ((unlink(tdb_file) < 0) && (errno != ENOENT)) {
retval = errno;
+ com_err("debugfs", retval,
+ "while trying to delete %s", tdb_file);
goto errout;
}
- set_undo_io_backing_manager(*io_ptr);
+ retval = set_undo_io_backing_manager(*io_ptr);
+ if (retval)
+ goto errout;
*io_ptr = undo_io_manager;
retval = set_undo_io_backup_file(tdb_file);
if (retval)
@@ -110,14 +114,9 @@ static int debugfs_setup_tdb(const char *device_name, char *undo_file,
"using the command:\n"
" e2undo %s %s\n\n", tdb_file, device_name);
- if (free_tdb_dir)
- free(tdb_dir);
free(tdb_file);
return 0;
-
errout:
- if (free_tdb_dir)
- free(tdb_dir);
free(tdb_file);
err:
com_err("debugfs", retval, "while trying to setup undo file\n");
diff --git a/e2fsck/unix.c b/e2fsck/unix.c
index 4bad553..9ef4b1e 100644
--- a/e2fsck/unix.c
+++ b/e2fsck/unix.c
@@ -682,6 +682,10 @@ static void parse_extended_opts(e2fsck_t ctx, const char *opts)
}
ctx->ext_attr_ver = ea_ver;
} else if (strcmp(token, "readahead_kb") == 0) {
+ if (!arg) {
+ extended_usage++;
+ continue;
+ }
reada_kb = strtoull(arg, &p, 0);
if (*p) {
fprintf(stderr, "%s",
@@ -1238,7 +1242,9 @@ static int e2fsck_setup_tdb(e2fsck_t ctx, io_manager *io_ptr)
/* (re)open a specific undo file */
if (ctx->undo_file && ctx->undo_file[0] != 0) {
- set_undo_io_backing_manager(*io_ptr);
+ retval = set_undo_io_backing_manager(*io_ptr);
+ if (retval)
+ goto err;
*io_ptr = undo_io_manager;
retval = set_undo_io_backup_file(ctx->undo_file);
if (retval)
@@ -1247,7 +1253,7 @@ static int e2fsck_setup_tdb(e2fsck_t ctx, io_manager *io_ptr)
"using the command:\n"
" e2undo %s %s\n\n"),
ctx->undo_file, ctx->filesystem_name);
- return 0;
+ return retval;
}
/*
@@ -1283,10 +1289,14 @@ static int e2fsck_setup_tdb(e2fsck_t ctx, io_manager *io_ptr)
if ((unlink(tdb_file) < 0) && (errno != ENOENT)) {
retval = errno;
+ com_err(ctx->program_name, retval,
+ _("while trying to delete %s"), tdb_file);
goto errout;
}
- set_undo_io_backing_manager(*io_ptr);
+ retval = set_undo_io_backing_manager(*io_ptr);
+ if (retval)
+ goto errout;
*io_ptr = undo_io_manager;
retval = set_undo_io_backup_file(tdb_file);
if (retval)
diff --git a/misc/e2undo.c b/misc/e2undo.c
index 3f312c6..6123c48 100644
--- a/misc/e2undo.c
+++ b/misc/e2undo.c
@@ -204,29 +204,29 @@ static int e2undo_setup_tdb(const char *name, io_manager *io_ptr)
{
errcode_t retval = 0;
const char *tdb_dir;
- char *tdb_file;
+ char *tdb_file = NULL;
char *dev_name, *tmp_name;
/* (re)open a specific undo file */
if (undo_file && undo_file[0] != 0) {
- set_undo_io_backing_manager(*io_ptr);
+ retval = set_undo_io_backing_manager(*io_ptr);
+ if (retval)
+ goto err;
*io_ptr = undo_io_manager;
- set_undo_io_backup_file(undo_file);
- printf(_("To undo the e2undo operation please run "
- "the command\n e2undo %s %s\n\n"),
+ retval = set_undo_io_backup_file(undo_file);
+ if (retval)
+ goto err;
+ printf(_("Overwriting existing filesystem; this can be undone "
+ "using the command:\n"
+ " e2undo %s %s\n\n"),
undo_file, name);
return retval;
}
- tmp_name = strdup(name);
- if (!tmp_name) {
- alloc_fn_fail:
- com_err(prg_name, ENOMEM, "%s",
- _("Couldn't allocate memory for tdb filename\n"));
- return ENOMEM;
- }
- dev_name = basename(tmp_name);
-
+ /*
+ * Configuration via a conf file would be
+ * nice
+ */
tdb_dir = getenv("E2FSPROGS_UNDO_DIR");
if (!tdb_dir)
tdb_dir = "/var/lib/e2fsprogs";
@@ -235,27 +235,43 @@ static int e2undo_setup_tdb(const char *name, io_manager *io_ptr)
access(tdb_dir, W_OK))
return 0;
- tdb_file = malloc(strlen(tdb_dir) + 9 + strlen(dev_name) + 7 + 1);
- if (!tdb_file)
- goto alloc_fn_fail;
+ tmp_name = strdup(name);
+ if (!tmp_name)
+ goto errout;
+ dev_name = basename(tmp_name);
+ tdb_file = malloc(strlen(tdb_dir) + 8 + strlen(dev_name) + 7 + 1);
+ if (!tdb_file) {
+ free(tmp_name);
+ goto errout;
+ }
sprintf(tdb_file, "%s/e2undo-%s.e2undo", tdb_dir, dev_name);
+ free(tmp_name);
if ((unlink(tdb_file) < 0) && (errno != ENOENT)) {
retval = errno;
com_err(prg_name, retval,
_("while trying to delete %s"), tdb_file);
- free(tdb_file);
- return retval;
+ goto errout;
}
- set_undo_io_backing_manager(*io_ptr);
+ retval = set_undo_io_backing_manager(*io_ptr);
+ if (retval)
+ goto errout;
*io_ptr = undo_io_manager;
- set_undo_io_backup_file(tdb_file);
- printf(_("To undo the e2undo operation please run "
- "the command\n e2undo %s %s\n\n"),
+ retval = set_undo_io_backup_file(tdb_file);
+ if (retval)
+ goto errout;
+ printf(_("Overwriting existing filesystem; this can be undone "
+ "using the command:\n"
+ " e2undo %s %s\n\n"),
tdb_file, name);
+
free(tdb_file);
- free(tmp_name);
+ return 0;
+errout:
+ free(tdb_file);
+err:
+ com_err(prg_name, retval, "while trying to setup undo file\n");
return retval;
}
diff --git a/misc/mke2fs.c b/misc/mke2fs.c
index 05a16d6..78b1252 100644
--- a/misc/mke2fs.c
+++ b/misc/mke2fs.c
@@ -2500,7 +2500,9 @@ static int mke2fs_setup_tdb(const char *name, io_manager *io_ptr)
/* (re)open a specific undo file */
if (undo_file && undo_file[0] != 0) {
- set_undo_io_backing_manager(*io_ptr);
+ retval = set_undo_io_backing_manager(*io_ptr);
+ if (retval)
+ goto err;
*io_ptr = undo_io_manager;
retval = set_undo_io_backup_file(undo_file);
if (retval)
@@ -2508,7 +2510,7 @@ static int mke2fs_setup_tdb(const char *name, io_manager *io_ptr)
printf(_("Overwriting existing filesystem; this can be undone "
"using the command:\n"
" e2undo %s %s\n\n"), undo_file, name);
- return 0;
+ return retval;
}
/*
@@ -2544,10 +2546,14 @@ static int mke2fs_setup_tdb(const char *name, io_manager *io_ptr)
if ((unlink(tdb_file) < 0) && (errno != ENOENT)) {
retval = errno;
+ com_err(program_name, retval,
+ _("while trying to delete %s"), tdb_file);
goto errout;
}
- set_undo_io_backing_manager(*io_ptr);
+ retval = set_undo_io_backing_manager(*io_ptr);
+ if (retval)
+ goto errout;
*io_ptr = undo_io_manager;
retval = set_undo_io_backup_file(tdb_file);
if (retval)
diff --git a/misc/tune2fs.c b/misc/tune2fs.c
index f97ec25..d2e8b20 100644
--- a/misc/tune2fs.c
+++ b/misc/tune2fs.c
@@ -2529,38 +2529,29 @@ static int tune2fs_setup_tdb(const char *name, io_manager *io_ptr)
{
errcode_t retval = 0;
const char *tdb_dir;
- char *tdb_file;
+ char *tdb_file = NULL;
char *dev_name, *tmp_name;
/* (re)open a specific undo file */
if (undo_file && undo_file[0] != 0) {
- set_undo_io_backing_manager(*io_ptr);
+ retval = set_undo_io_backing_manager(*io_ptr);
+ if (retval)
+ goto err;
*io_ptr = undo_io_manager;
- set_undo_io_backup_file(undo_file);
- printf(_("To undo the tune2fs operation please run "
- "the command\n e2undo %s %s\n\n"),
+ retval = set_undo_io_backup_file(undo_file);
+ if (retval)
+ goto err;
+ printf(_("Overwriting existing filesystem; this can be undone "
+ "using the command:\n"
+ " e2undo %s %s\n\n"),
undo_file, name);
return retval;
}
-#if 0 /* FIXME!! */
/*
* Configuration via a conf file would be
* nice
*/
- profile_get_string(profile, "scratch_files",
- "directory", 0, 0,
- &tdb_dir);
-#endif
- tmp_name = strdup(name);
- if (!tmp_name) {
- alloc_fn_fail:
- com_err(program_name, ENOMEM, "%s",
- _("Couldn't allocate memory for tdb filename\n"));
- return ENOMEM;
- }
- dev_name = basename(tmp_name);
-
tdb_dir = getenv("E2FSPROGS_UNDO_DIR");
if (!tdb_dir)
tdb_dir = "/var/lib/e2fsprogs";
@@ -2569,27 +2560,43 @@ static int tune2fs_setup_tdb(const char *name, io_manager *io_ptr)
access(tdb_dir, W_OK))
return 0;
+ tmp_name = strdup(name);
+ if (!tmp_name)
+ goto errout;
+ dev_name = basename(tmp_name);
tdb_file = malloc(strlen(tdb_dir) + 9 + strlen(dev_name) + 7 + 1);
- if (!tdb_file)
- goto alloc_fn_fail;
+ if (!tdb_file) {
+ free(tmp_name);
+ goto errout;
+ }
sprintf(tdb_file, "%s/tune2fs-%s.e2undo", tdb_dir, dev_name);
+ free(tmp_name);
if ((unlink(tdb_file) < 0) && (errno != ENOENT)) {
retval = errno;
com_err(program_name, retval,
_("while trying to delete %s"), tdb_file);
- free(tdb_file);
- return retval;
+ goto errout;
}
- set_undo_io_backing_manager(*io_ptr);
+ retval = set_undo_io_backing_manager(*io_ptr);
+ if (retval)
+ goto errout;
*io_ptr = undo_io_manager;
- set_undo_io_backup_file(tdb_file);
- printf(_("To undo the tune2fs operation please run "
- "the command\n e2undo %s %s\n\n"),
+ retval = set_undo_io_backup_file(tdb_file);
+ if (retval)
+ goto errout;
+ printf(_("Overwriting existing filesystem; this can be undone "
+ "using the command:\n"
+ " e2undo %s %s\n\n"),
tdb_file, name);
+
free(tdb_file);
- free(tmp_name);
+ return 0;
+errout:
+ free(tdb_file);
+err:
+ com_err("tune2fs", retval, "while trying to setup undo file\n");
return retval;
}
diff --git a/resize/main.c b/resize/main.c
index a61943e..9da3a95 100644
--- a/resize/main.c
+++ b/resize/main.c
@@ -170,11 +170,12 @@ static int resize2fs_setup_tdb(const char *device_name, char *undo_file,
errcode_t retval = ENOMEM;
char *tdb_dir = NULL, *tdb_file = NULL;
char *dev_name, *tmp_name;
- int free_tdb_dir = 0;
/* (re)open a specific undo file */
if (undo_file && undo_file[0] != 0) {
- set_undo_io_backing_manager(*io_ptr);
+ retval = set_undo_io_backing_manager(*io_ptr);
+ if (retval)
+ goto err;
*io_ptr = undo_io_manager;
retval = set_undo_io_backup_file(undo_file);
if (retval)
@@ -183,7 +184,7 @@ static int resize2fs_setup_tdb(const char *device_name, char *undo_file,
"using the command:\n"
" e2undo %s %s\n\n"),
undo_file, device_name);
- return 0;
+ return retval;
}
/*
@@ -191,19 +192,18 @@ static int resize2fs_setup_tdb(const char *device_name, char *undo_file,
* nice
*/
tdb_dir = getenv("E2FSPROGS_UNDO_DIR");
+ if (!tdb_dir)
+ tdb_dir = "/var/lib/e2fsprogs";
- if (tdb_dir == NULL || !strcmp(tdb_dir, "none") || (tdb_dir[0] == 0) ||
- access(tdb_dir, W_OK)) {
- if (free_tdb_dir)
- free(tdb_dir);
+ if (!strcmp(tdb_dir, "none") || (tdb_dir[0] == 0) ||
+ access(tdb_dir, W_OK))
return 0;
- }
tmp_name = strdup(device_name);
if (!tmp_name)
goto errout;
dev_name = basename(tmp_name);
- tdb_file = malloc(strlen(tdb_dir) + 8 + strlen(dev_name) + 7 + 1);
+ tdb_file = malloc(strlen(tdb_dir) + 11 + strlen(dev_name) + 7 + 1);
if (!tdb_file) {
free(tmp_name);
goto errout;
@@ -213,10 +213,14 @@ static int resize2fs_setup_tdb(const char *device_name, char *undo_file,
if ((unlink(tdb_file) < 0) && (errno != ENOENT)) {
retval = errno;
+ com_err(program_name, retval,
+ _("while trying to delete %s"), tdb_file);
goto errout;
}
- set_undo_io_backing_manager(*io_ptr);
+ retval = set_undo_io_backing_manager(*io_ptr);
+ if (retval)
+ goto errout;
*io_ptr = undo_io_manager;
retval = set_undo_io_backup_file(tdb_file);
if (retval)
@@ -225,14 +229,9 @@ static int resize2fs_setup_tdb(const char *device_name, char *undo_file,
"using the command:\n"
" e2undo %s %s\n\n"), tdb_file, device_name);
- if (free_tdb_dir)
- free(tdb_dir);
free(tdb_file);
return 0;
-
errout:
- if (free_tdb_dir)
- free(tdb_dir);
free(tdb_file);
err:
com_err(program_name, retval, "%s",
--
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