From: Ghanshyam Agrawal <ghanshyam1898@xxxxxxxxx> [ Upstream commit 839f102efb168f02dfdd46717b7c6dddb26b015e ] The stbl might contain some invalid values. Added a check to return error code in that case. Reported-by: syzbot+0315f8fe99120601ba88@xxxxxxxxxxxxxxxxxxxxxxxxx Closes: https://syzkaller.appspot.com/bug?extid=0315f8fe99120601ba88 Signed-off-by: Ghanshyam Agrawal <ghanshyam1898@xxxxxxxxx> Signed-off-by: Dave Kleikamp <dave.kleikamp@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- 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 8f7ce1bea44c5..a3d1d560f4c86 100644 --- a/fs/jfs/jfs_dtree.c +++ b/fs/jfs/jfs_dtree.c @@ -3187,6 +3187,14 @@ 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) > -- 2.43.0
