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jfs: fix array-index-out-of-bounds in jfs_readdir

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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>
This commit is contained in:
Ghanshyam Agrawal 2024-10-01 11:35:47 +05:30 committed by Dave Kleikamp
parent a5f5e4698f
commit 839f102efb
1 changed files with 8 additions and 0 deletions
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8
fs/jfs/jfs_dtree.c
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@ -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) >