[libvirt] [PATCH] Fix misc bugs in virCommandPtr

The virCommandNewArgs() method would free the virCommandPtr if it failed to add the args. This meant errors reported in virCommandAddArgSet() were lost. Simply removing the check for errors from the constructor means they can be reported correctly later The virCommandAddEnvPassCommon() method failed to check for errors before reallocating the cmd->env array, causing a potential SEGV if cmd was NULL The virCommandAddArgSet() method needs to validate that at least 1 element in 'val's parameter is non-NULL, otherwise code like cmd = virCommandNew(binary) virCommandAddAtg(cmd, "foo") Would end up trying todo execve("foo"), if binary was NULL. --- src/util/command.c | 13 ++++++++----- 1 files changed, 8 insertions(+), 5 deletions(-) diff --git a/src/util/command.c b/src/util/command.c index ff2bd46..22f350b 100644 --- a/src/util/command.c +++ b/src/util/command.c @@ -109,11 +109,6 @@ virCommandNewArgs(const char *const*args) virCommandAddArgSet(cmd, args); - if (cmd->has_error) { - virCommandFree(cmd); - return NULL; - } - return cmd; } @@ -362,6 +357,9 @@ virCommandAddEnvPass(virCommandPtr cmd, const char *name) void virCommandAddEnvPassCommon(virCommandPtr cmd) { + if (!cmd || cmd->has_error) + return; + /* Attempt to Pre-allocate; allocation failure will be detected * later during virCommandAdd*. */ ignore_value(VIR_RESIZE_N(cmd->env, cmd->maxenv, cmd->nenv, 9)); @@ -478,6 +476,11 @@ virCommandAddArgSet(virCommandPtr cmd, const char *const*vals) if (!cmd || cmd->has_error) return; + if (vals[0] == NULL) { + cmd->has_error = EINVAL; + return; + } + while (vals[narg] != NULL) narg++; -- 1.7.4