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Message-ID: <20240926120753.3639404-4-zhaomzhao@126.com>
Date: Thu, 26 Sep 2024 20:07:53 +0800
From: Zhao Mengmeng <zhaomzhao@....com>
To: jack@...e.com,
zhaomengmeng@...inos.cn
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/3] udf: refactor inode_bmap() to handle error
From: Zhao Mengmeng <zhaomengmeng@...inos.cn>
Refactor inode_bmap() to handle error since udf_next_aext() can return
error now. On situations like ftruncate, udf_extend_file() can now
detect errors and bail out early without resorting to checking for
particular offsets and assuming internal behavior of these functions.
Reported-by: syzbot+7a4842f0b1801230a989@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=7a4842f0b1801230a989
Tested-by: syzbot+7a4842f0b1801230a989@...kaller.appspotmail.com
Signed-off-by: Zhao Mengmeng <zhaomengmeng@...inos.cn>
Suggested-by: Jan Kara <jack@...e.cz>
---
fs/udf/directory.c | 13 ++++++++-----
fs/udf/inode.c | 29 ++++++++++++++++++-----------
fs/udf/partition.c | 6 ++++--
fs/udf/truncate.c | 8 +++++---
fs/udf/udfdecl.h | 5 +++--
5 files changed, 38 insertions(+), 23 deletions(-)
diff --git a/fs/udf/directory.c b/fs/udf/directory.c
index 82922a4ae425..4b8bb77eaffa 100644
--- a/fs/udf/directory.c
+++ b/fs/udf/directory.c
@@ -246,6 +246,7 @@ int udf_fiiter_init(struct udf_fileident_iter *iter, struct inode *dir,
{
struct udf_inode_info *iinfo = UDF_I(dir);
int err = 0;
+ int8_t etype;
iter->dir = dir;
iter->bh[0] = iter->bh[1] = NULL;
@@ -265,9 +266,9 @@ int udf_fiiter_init(struct udf_fileident_iter *iter, struct inode *dir,
goto out;
}
- if (inode_bmap(dir, iter->pos >> dir->i_blkbits, &iter->epos,
- &iter->eloc, &iter->elen, &iter->loffset) !=
- (EXT_RECORDED_ALLOCATED >> 30)) {
+ err = inode_bmap(dir, iter->pos >> dir->i_blkbits, &iter->epos, &iter->eloc,
+ &iter->elen, &iter->loffset, &etype);
+ if (err || etype != (EXT_RECORDED_ALLOCATED >> 30)) {
if (pos == dir->i_size)
return 0;
udf_err(dir->i_sb,
@@ -463,6 +464,7 @@ int udf_fiiter_append_blk(struct udf_fileident_iter *iter)
sector_t block;
uint32_t old_elen = iter->elen;
int err;
+ int8_t etype;
if (WARN_ON_ONCE(iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB))
return -EINVAL;
@@ -477,8 +479,9 @@ int udf_fiiter_append_blk(struct udf_fileident_iter *iter)
udf_fiiter_update_elen(iter, old_elen);
return err;
}
- if (inode_bmap(iter->dir, block, &iter->epos, &iter->eloc, &iter->elen,
- &iter->loffset) != (EXT_RECORDED_ALLOCATED >> 30)) {
+ err = inode_bmap(iter->dir, block, &iter->epos, &iter->eloc, &iter->elen,
+ &iter->loffset, &etype);
+ if (err || etype != (EXT_RECORDED_ALLOCATED >> 30)) {
udf_err(iter->dir->i_sb,
"block %llu not allocated in directory (ino %lu)\n",
(unsigned long long)block, iter->dir->i_ino);
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 6c4f104e2bf7..be9356f0eecf 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -418,10 +418,11 @@ static int udf_map_block(struct inode *inode, struct udf_map_rq *map)
uint32_t elen;
sector_t offset;
struct extent_position epos = {};
+ int8_t etype;
down_read(&iinfo->i_data_sem);
- if (inode_bmap(inode, map->lblk, &epos, &eloc, &elen, &offset)
- == (EXT_RECORDED_ALLOCATED >> 30)) {
+ err = inode_bmap(inode, map->lblk, &epos, &eloc, &elen, &offset, &etype);
+ if (!err && etype == (EXT_RECORDED_ALLOCATED >> 30)) {
map->pblk = udf_get_lb_pblock(inode->i_sb, &eloc,
offset);
map->oflags |= UDF_BLK_MAPPED;
@@ -664,8 +665,10 @@ static int udf_extend_file(struct inode *inode, loff_t newsize)
*/
udf_discard_prealloc(inode);
- etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
- within_last_ext = (etype != -1);
+ err = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset, &etype);
+ if (UDF_EXT_ERR(err))
+ goto out;
+ within_last_ext = (!err);
/* We don't expect extents past EOF... */
WARN_ON_ONCE(within_last_ext &&
elen > ((loff_t)offset + 1) << inode->i_blkbits);
@@ -2391,13 +2394,17 @@ int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
return (elen >> 30);
}
-int8_t inode_bmap(struct inode *inode, sector_t block,
- struct extent_position *pos, struct kernel_lb_addr *eloc,
- uint32_t *elen, sector_t *offset)
+/*
+ * return 0 when iudf_next_aext() loop success.
+ * return err < 0 and err != -ENODATA indicates error.
+ * return err == -ENODATA indicates hit EOF.
+ */
+int inode_bmap(struct inode *inode, sector_t block, struct extent_position *pos,
+ struct kernel_lb_addr *eloc, uint32_t *elen, sector_t *offset,
+ int8_t *etype)
{
unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits;
- int8_t etype;
struct udf_inode_info *iinfo;
int err = 0;
@@ -2409,18 +2416,18 @@ int8_t inode_bmap(struct inode *inode, sector_t block,
}
*elen = 0;
do {
- err = udf_next_aext(inode, pos, eloc, elen, &etype, 1);
+ err = udf_next_aext(inode, pos, eloc, elen, etype, 1);
if (UDF_EXT_EOF(err)) {
*offset = (bcount - lbcount) >> blocksize_bits;
iinfo->i_lenExtents = lbcount;
}
if (err < 0)
- return -1;
+ return err;
lbcount += *elen;
} while (lbcount <= bcount);
/* update extent cache */
udf_update_extent_cache(inode, lbcount - *elen, pos);
*offset = (bcount + *elen - lbcount) >> blocksize_bits;
- return etype;
+ return 0;
}
diff --git a/fs/udf/partition.c b/fs/udf/partition.c
index af877991edc1..c441d4ae1f96 100644
--- a/fs/udf/partition.c
+++ b/fs/udf/partition.c
@@ -282,9 +282,11 @@ static uint32_t udf_try_read_meta(struct inode *inode, uint32_t block,
sector_t ext_offset;
struct extent_position epos = {};
uint32_t phyblock;
+ int8_t etype;
+ int err = 0;
- if (inode_bmap(inode, block, &epos, &eloc, &elen, &ext_offset) !=
- (EXT_RECORDED_ALLOCATED >> 30))
+ err = inode_bmap(inode, block, &epos, &eloc, &elen, &ext_offset, &etype);
+ if (err || etype != (EXT_RECORDED_ALLOCATED >> 30))
phyblock = 0xFFFFFFFF;
else {
map = &UDF_SB(sb)->s_partmaps[partition];
diff --git a/fs/udf/truncate.c b/fs/udf/truncate.c
index af06f7101859..d13ba9fd1309 100644
--- a/fs/udf/truncate.c
+++ b/fs/udf/truncate.c
@@ -208,10 +208,12 @@ int udf_truncate_extents(struct inode *inode)
else
BUG();
- etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
+ err = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset, &etype);
byte_offset = (offset << sb->s_blocksize_bits) +
- (inode->i_size & (sb->s_blocksize - 1));
- if (etype == -1) {
+ (inode->i_size & (sb->s_blocksize - 1));
+ if (UDF_EXT_ERR(err))
+ return err;
+ if (UDF_EXT_EOF(err)) {
/* We should extend the file? */
WARN_ON(byte_offset);
return 0;
diff --git a/fs/udf/udfdecl.h b/fs/udf/udfdecl.h
index 206077da9968..a156ed95189a 100644
--- a/fs/udf/udfdecl.h
+++ b/fs/udf/udfdecl.h
@@ -160,8 +160,9 @@ extern struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block,
extern int udf_setsize(struct inode *, loff_t);
extern void udf_evict_inode(struct inode *);
extern int udf_write_inode(struct inode *, struct writeback_control *wbc);
-extern int8_t inode_bmap(struct inode *, sector_t, struct extent_position *,
- struct kernel_lb_addr *, uint32_t *, sector_t *);
+extern int inode_bmap(struct inode *inode, sector_t block,
+ struct extent_position *pos, struct kernel_lb_addr *eloc,
+ uint32_t *elen, sector_t *offset, int8_t *etype);
int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
extern int udf_setup_indirect_aext(struct inode *inode, udf_pblk_t block,
struct extent_position *epos);
--
2.43.0
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