This is a note to let you know that I've just added the patch titled
jfs: fix array-index-out-of-bounds in jfs_readdir
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
jfs-fix-array-index-out-of-bounds-in-jfs_readdir.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit e49fa5ec810e10351a8c32df8f7427c859eb3746
Author: Ghanshyam Agrawal <ghanshyam1898@xxxxxxxxx>
Date: Tue Oct 1 11:35:47 2024 +0530
jfs: fix array-index-out-of-bounds in jfs_readdir
[ 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>
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) >
