diff options
| author | Jan Kara <jack@suse.cz> | 2021-10-18 12:37:41 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-11-12 14:40:50 +0100 |
| commit | b0ddff8d68f2e43857a84dce54c3deab181c8ae1 (patch) | |
| tree | e758cc7ed80cf8cf4a860015d580e6870a1588a1 /fs | |
| parent | a9342139ac906e97675bb250ce69e0e683504943 (diff) | |
isofs: Fix out of bound access for corrupted isofs image
commit e96a1866b40570b5950cda8602c2819189c62a48 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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/isofs/inode.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c index 2355ad62b81f..6e4e2cfd40b9 100644 --- a/fs/isofs/inode.c +++ b/fs/isofs/inode.c @@ -1326,6 +1326,8 @@ 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; |