diff options
| author | Kevin Wolf <kwolf@redhat.com> | 2014-03-26 13:05:34 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2014-04-01 13:59:47 +0200 |
| commit | 8e53abbc20d08ae3ec30c2054e1161314ad9501d (patch) | |
| tree | bddf225073fc61d129d292b9300e40d9526037fa /block/bochs.c | |
| parent | e3737b820b45e54b059656dc3f914f895ac7a88b (diff) | |
| download | qemu-8e53abbc20d08ae3ec30c2054e1161314ad9501d.tar.gz qemu-8e53abbc20d08ae3ec30c2054e1161314ad9501d.tar.bz2 qemu-8e53abbc20d08ae3ec30c2054e1161314ad9501d.zip | |
bochs: Check extent_size header field (CVE-2014-0142)
This fixes two possible division by zero crashes: In bochs_open() and in
seek_to_sector().
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'block/bochs.c')
| -rw-r--r-- | block/bochs.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/block/bochs.c b/block/bochs.c index 0ffa9c1ba7..a922782c1d 100644 --- a/block/bochs.c +++ b/block/bochs.c @@ -148,6 +148,14 @@ static int bochs_open(BlockDriverState *bs, QDict *options, int flags, s->extent_blocks = 1 + (le32_to_cpu(bochs.extent) - 1) / 512; s->extent_size = le32_to_cpu(bochs.extent); + if (s->extent_size == 0) { + error_setg(errp, "Extent size may not be zero"); + return -EINVAL; + } else if (s->extent_size > 0x800000) { + error_setg(errp, "Extent size %" PRIu32 " is too large", + s->extent_size); + return -EINVAL; + } if (s->catalog_size < bs->total_sectors / s->extent_size) { error_setg(errp, "Catalog size is too small for this disk size"); |