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qemu-io-cmds: assert that we don't have .perm requested in no-blk case

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Coverity thinks blk may be NULL. It's a false-positive, as described in
a new comment.

Fixes: Coverity CID 1453194
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20210519090532.3753-1-vsementsov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2021-05-19 12:05:32 +03:00 committed by Kevin Wolf
parent 5529b02da2
commit 8eaf10187a
1 changed files with 12 additions and 2 deletions
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14
qemu-io-cmds.c
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@ -92,9 +92,19 @@ static int command(BlockBackend *blk, const cmdinfo_t *ct, int argc,
return -EINVAL;
}
/* Request additional permissions if necessary for this command. The caller
/*
* Request additional permissions if necessary for this command. The caller
* is responsible for restoring the original permissions afterwards if this
* is what it wants. */
* is what it wants.
*
* Coverity thinks that blk may be NULL in the following if condition. It's
* not so: in init_check_command() we fail if blk is NULL for command with
* both CMD_FLAG_GLOBAL and CMD_NOFILE_OK flags unset. And in
* qemuio_add_command() we assert that command with non-zero .perm field
* doesn't set this flags. So, the following assertion is to silence
* Coverity:
*/
assert(blk || !ct->perm);
if (ct->perm && blk_is_available(blk)) {
uint64_t orig_perm, orig_shared_perm;
blk_get_perm(blk, &orig_perm, &orig_shared_perm);