From 4e876bcf2bdb3a7353df92d19bfec0afd1650bc4 Mon Sep 17 00:00:00 2001 From: Max Reitz Date: Wed, 6 Apr 2016 18:32:48 +0200 Subject: qcow2: Prevent backing file names longer than 1023 We reject backing file names with a length of more than 1023 characters when opening a qcow2 file, so we should not produce such files ourselves. Cc: qemu-stable@nongnu.org Signed-off-by: Max Reitz Signed-off-by: Kevin Wolf --- block/qcow2.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'block/qcow2.c') diff --git a/block/qcow2.c b/block/qcow2.c index 056525c7fd..470734be9f 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -1986,6 +1986,10 @@ static int qcow2_change_backing_file(BlockDriverState *bs, { BDRVQcow2State *s = bs->opaque; + if (backing_file && strlen(backing_file) > 1023) { + return -EINVAL; + } + pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); -- cgit v1.2.3