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qemu-io-cmds: Assert that global and nofile commands don't use ct->perms

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It would be a bug for a command with the CMD_NOFILE_OK or
CMD_FLAG_GLOBAL flags set to also set the ct->perms field,
because the former says "OK for a file not to be open"
but the latter is a check on a file.

Add an assertion in qemuio_add_command() so we can catch that
sort of buggy command definition immediately rather than it
being a bug that only manifests when a particular set of
command line options is used.

(Coverity gets confused about this (CID 1371723) and reports
that we might dereference a NULL blk pointer in this case,
because it can't tell that that code path never happens with
the cmdinfo_t that we have. This commit won't help unconfuse
it, but it does fix the underlying issue.)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1490967529-4767-1-git-send-email-peter.maydell@linaro.org
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Peter Maydell 2017-03-31 14:38:49 +01:00 committed by Max Reitz
parent d1c136885b
commit 6aabeb5839
1 changed files with 7 additions and 0 deletions
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7
qemu-io-cmds.c
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@ -35,6 +35,13 @@ static int compare_cmdname(const void *a, const void *b)
void qemuio_add_command(const cmdinfo_t *ci)
{
/* ci->perm assumes a file is open, but the GLOBAL and NOFILE_OK
* flags allow it not to be, so that combination is invalid.
* Catch it now rather than letting it manifest as a crash if a
* particular set of command line options are used.
*/
assert(ci->perm == 0 ||
(ci->flags & (CMD_FLAG_GLOBAL | CMD_NOFILE_OK)) == 0);
cmdtab = g_renew(cmdinfo_t, cmdtab, ++ncmds);
cmdtab[ncmds - 1] = *ci;
qsort(cmdtab, ncmds, sizeof(*cmdtab), compare_cmdname);