From: Ghanshyam Agrawal ghanshyam1898@gmail.com
[ Upstream commit 839f102efb168f02dfdd46717b7c6dddb26b015e ]
The stbl might contain some invalid values. Added a check to return error code in that case.
Reported-by: syzbot+0315f8fe99120601ba88@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=0315f8fe99120601ba88 Signed-off-by: Ghanshyam Agrawal ghanshyam1898@gmail.com Signed-off-by: Dave Kleikamp dave.kleikamp@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/jfs/jfs_dtree.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/fs/jfs/jfs_dtree.c b/fs/jfs/jfs_dtree.c index 69fd936fbdb37..8f85177f284b5 100644 --- a/fs/jfs/jfs_dtree.c +++ b/fs/jfs/jfs_dtree.c @@ -2891,6 +2891,14 @@ int jfs_readdir(struct file *file, struct dir_context *ctx) stbl = DT_GETSTBL(p);
for (i = index; i < p->header.nextindex; i++) { + if (stbl[i] < 0 || stbl[i] > 127) { + jfs_err("JFS: Invalid stbl[%d] = %d for inode %ld, block = %lld", + i, stbl[i], (long)ip->i_ino, (long long)bn); + free_page(dirent_buf); + DT_PUTPAGE(mp); + return -EIO; + } + d = (struct ldtentry *) & p->slot[stbl[i]];
if (((long) jfs_dirent + d->namlen + 1) >