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| author | Stefan Hajnoczi <stefanha@redhat.com> | 2014-03-26 13:05:55 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2014-04-01 15:22:35 +0200 |
| commit | 73ed27ec28a1dbebdd2ae792284151f029950fbe (patch) | |
| tree | 9b35d05f937d38cbd85e1d4fd3a4d707f988da88 /block/dmg.c | |
| parent | 2c1885adcf0312da80c7317b09f9adad97fa0fc6 (diff) | |
| download | qemu-73ed27ec28a1dbebdd2ae792284151f029950fbe.zip qemu-73ed27ec28a1dbebdd2ae792284151f029950fbe.tar.gz qemu-73ed27ec28a1dbebdd2ae792284151f029950fbe.tar.bz2 | |
dmg: prevent out-of-bounds array access on terminator
When a terminator is reached the base for offsets and sectors is stored.
The following records that are processed will use this base value.
If the first record we encounter is a terminator, then calculating the
base values would result in out-of-bounds array accesses. Don't do
that.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'block/dmg.c')
| -rw-r--r-- | block/dmg.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/dmg.c b/block/dmg.c index be2f26e..f4f3e8e 100644 --- a/block/dmg.c +++ b/block/dmg.c @@ -182,7 +182,7 @@ static int dmg_open(BlockDriverState *bs, QDict *options, int flags, offset += 4; if (s->types[i] != 0x80000005 && s->types[i] != 1 && s->types[i] != 2) { - if (s->types[i] == 0xffffffff) { + if (s->types[i] == 0xffffffff && i > 0) { last_in_offset = s->offsets[i - 1] + s->lengths[i - 1]; last_out_offset = s->sectors[i - 1] + s->sectorcounts[i - 1]; |