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| author | Jan Kara <jack@suse.cz> | 2021-10-18 12:37:41 +0200 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2021-10-19 12:51:02 +0200 |
| commit | e96a1866b40570b5950cda8602c2819189c62a48 (patch) | |
| tree | bc072688dd9d5cf68965fb96e6f34de6c9675151 /fs/isofs | |
| parent | d0e36a62bd4c60c09acc40e06ba4831a4d0bc75b (diff) | |
| download | linux-e96a1866b40570b5950cda8602c2819189c62a48.tar.gz linux-e96a1866b40570b5950cda8602c2819189c62a48.tar.bz2 linux-e96a1866b40570b5950cda8602c2819189c62a48.zip | |
isofs: Fix out of bound access for corrupted isofs image
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>
Diffstat (limited to 'fs/isofs')
| -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 678e2c51b855..0c6eacfcbeef 100644 --- a/fs/isofs/inode.c +++ b/fs/isofs/inode.c @@ -1322,6 +1322,8 @@ 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; |