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isofs: Fix out of bound access for corrupted isofs image 

commit e96a1866b4 upstream.

When isofs image is suitably corrupted isofs_read_inode() can read data
beyond the end of buffer. Sanity-check the directory entry length before
using it.

Reported-and-tested-by: syzbot+6fc7fb214625d82af7d1@syzkaller.appspotmail.com
CC: stable@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jan Kara 2021-10-18 12:37:41 +02:00 committed by Greg Kroah-Hartman
parent 7dca9fa41c
commit 9ec33a9b87
1 changed files with 2 additions and 0 deletions
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2
fs/isofs/inode.c
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@ -1265,6 +1265,8 @@ static int isofs_read_inode(struct inode *inode, int relocated)
de = (struct iso_directory_record *) (bh->b_data + offset);
de_len = *(unsigned char *) de;
if (de_len < sizeof(struct iso_directory_record))
goto fail;
if (offset + de_len > bufsize) {
int frag1 = bufsize - offset;