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Date: Tue, 10 Dec 2013 17:21:28 -0800
From: "Darrick J. Wong" <darrick.wong@...cle.com>
To: tytso@....edu, darrick.wong@...cle.com
Cc: linux-ext4@...r.kernel.org
Subject: [PATCH 28/74] libext2fs: check return values
Fix up a few places where we ignore return values.
Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
lib/ext2fs/flushb.c | 2 +-
lib/ext2fs/icount.c | 2 ++
lib/ext2fs/imager.c | 7 ++++++-
lib/ext2fs/mkjournal.c | 4 +++-
lib/ext2fs/punch.c | 7 +++++++
5 files changed, 19 insertions(+), 3 deletions(-)
diff --git a/lib/ext2fs/flushb.c b/lib/ext2fs/flushb.c
index ac8923c..98821fc 100644
--- a/lib/ext2fs/flushb.c
+++ b/lib/ext2fs/flushb.c
@@ -70,7 +70,7 @@ errcode_t ext2fs_sync_device(int fd, int flushb)
#warning BLKFLSBUF not defined
#endif
#ifdef FDFLUSH
- ioctl (fd, FDFLUSH, 0); /* In case this is a floppy */
+ return ioctl(fd, FDFLUSH, 0); /* In case this is a floppy */
#elif defined(__linux__)
#warning FDFLUSH not defined
#endif
diff --git a/lib/ext2fs/icount.c b/lib/ext2fs/icount.c
index 84b74a9..c5ebf74 100644
--- a/lib/ext2fs/icount.c
+++ b/lib/ext2fs/icount.c
@@ -193,6 +193,8 @@ errcode_t ext2fs_create_icount_tdb(ext2_filsys fs, char *tdb_dir,
uuid_unparse(fs->super->s_uuid, uuid);
sprintf(fn, "%s/%s-icount-XXXXXX", tdb_dir, uuid);
fd = mkstemp(fn);
+ if (fd < 0)
+ return fd;
/*
* This is an overestimate of the size that we will need; the
diff --git a/lib/ext2fs/imager.c b/lib/ext2fs/imager.c
index 7f3b25b..378a3c8 100644
--- a/lib/ext2fs/imager.c
+++ b/lib/ext2fs/imager.c
@@ -66,6 +66,7 @@ errcode_t ext2fs_image_inode_write(ext2_filsys fs, int fd, int flags)
blk64_t blk;
ssize_t actual;
errcode_t retval;
+ off_t r;
buf = malloc(fs->blocksize * BUF_BLOCKS);
if (!buf)
@@ -97,7 +98,11 @@ errcode_t ext2fs_image_inode_write(ext2_filsys fs, int fd, int flags)
blk++;
left--;
cp += fs->blocksize;
- lseek(fd, fs->blocksize, SEEK_CUR);
+ r = lseek(fd, fs->blocksize, SEEK_CUR);
+ if (r < 0) {
+ retval = errno;
+ goto errout;
+ }
continue;
}
/* Find non-zero blocks */
diff --git a/lib/ext2fs/mkjournal.c b/lib/ext2fs/mkjournal.c
index 2afd3b7..1d5b1a7 100644
--- a/lib/ext2fs/mkjournal.c
+++ b/lib/ext2fs/mkjournal.c
@@ -520,8 +520,10 @@ errcode_t ext2fs_add_journal_inode(ext2_filsys fs, blk_t num_blocks, int flags)
#if HAVE_EXT2_IOCTLS
fd = open(jfile, O_RDONLY);
if (fd >= 0) {
- ioctl(fd, EXT2_IOC_SETFLAGS, &f);
+ retval = ioctl(fd, EXT2_IOC_SETFLAGS, &f);
close(fd);
+ if (retval)
+ return retval;
}
#endif
#endif
diff --git a/lib/ext2fs/punch.c b/lib/ext2fs/punch.c
index 790a0ad8..ceec336 100644
--- a/lib/ext2fs/punch.c
+++ b/lib/ext2fs/punch.c
@@ -192,6 +192,13 @@ static errcode_t ext2fs_punch_extent(ext2_filsys fs, ext2_ino_t ino,
retval = ext2fs_extent_open2(fs, ino, inode, &handle);
if (retval)
return retval;
+ /*
+ * Find the extent closest to the start of the punch range. We don't
+ * check the return value because _goto() sets the current node to the
+ * next-lowest extent if 'start' is in a hole, and doesn't set a
+ * current node if there was a real error reading the extent tree.
+ * In that case, _get() will error out.
+ */
ext2fs_extent_goto(handle, start);
retval = ext2fs_extent_get(handle, EXT2_EXTENT_CURRENT, &extent);
if (retval)
--
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