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author | Philippe Mathieu-Daudé <philmd@redhat.com> | 2020-07-20 14:20:15 +0200 |
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committer | Philippe Mathieu-Daudé <philmd@redhat.com> | 2020-07-21 16:47:54 +0200 |
commit | 077195187b47d83418e5fb521c89d7881fab3049 (patch) | |
tree | 4cc3d890409e2e0e60538838230cdc6d440b4415 /hw | |
parent | a3ad58342a9d88d1baafc0aee39302f79faad480 (diff) | |
download | qemu-077195187b47d83418e5fb521c89d7881fab3049.zip qemu-077195187b47d83418e5fb521c89d7881fab3049.tar.gz qemu-077195187b47d83418e5fb521c89d7881fab3049.tar.bz2 |
hw/nvram/fw_cfg: Let fw_cfg_add_from_generator() return boolean value
Commits b6d7e9b66f..a43770df5d simplified the error propagation.
Similarly to commit 6fd5bef10b "qom: Make functions taking Error**
return bool, not void", let fw_cfg_add_from_generator() return a
boolean value, not void.
This allow to simplify parse_fw_cfg() and fixes the error handling
issue reported by Coverity (CID 1430396):
In parse_fw_cfg():
Variable assigned once to a constant guards dead code.
Local variable local_err is assigned only once, to a constant
value, making it effectively constant throughout its scope.
If this is not the intent, examine the logic to see if there
is a missing assignment that would make local_err not remain
constant.
It's the call of fw_cfg_add_from_generator():
Error *local_err = NULL;
fw_cfg_add_from_generator(fw_cfg, name, gen_id, errp);
if (local_err) {
error_propagate(errp, local_err);
return -1;
}
return 0;
If it fails, parse_fw_cfg() sets an error and returns 0, which is
wrong. Harmless, because the only caller passes &error_fatal.
Reported-by: Peter Maydell <peter.maydell@linaro.org>
Fixes: Coverity CID 1430396: 'Constant' variable guards dead code (DEADCODE)
Fixes: 6552d87c48 ("softmmu/vl: Let -fw_cfg option take a 'gen_id' argument")
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200721131911.27380-3-philmd@redhat.com>
Diffstat (limited to 'hw')
-rw-r--r-- | hw/nvram/fw_cfg.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c index dfa1f20..f3a4728 100644 --- a/hw/nvram/fw_cfg.c +++ b/hw/nvram/fw_cfg.c @@ -1032,7 +1032,7 @@ void *fw_cfg_modify_file(FWCfgState *s, const char *filename, return NULL; } -void fw_cfg_add_from_generator(FWCfgState *s, const char *filename, +bool fw_cfg_add_from_generator(FWCfgState *s, const char *filename, const char *gen_id, Error **errp) { FWCfgDataGeneratorClass *klass; @@ -1043,20 +1043,22 @@ void fw_cfg_add_from_generator(FWCfgState *s, const char *filename, obj = object_resolve_path_component(object_get_objects_root(), gen_id); if (!obj) { error_setg(errp, "Cannot find object ID '%s'", gen_id); - return; + return false; } if (!object_dynamic_cast(obj, TYPE_FW_CFG_DATA_GENERATOR_INTERFACE)) { error_setg(errp, "Object ID '%s' is not a '%s' subclass", gen_id, TYPE_FW_CFG_DATA_GENERATOR_INTERFACE); - return; + return false; } klass = FW_CFG_DATA_GENERATOR_GET_CLASS(obj); array = klass->get_data(obj, errp); if (!array) { - return; + return false; } size = array->len; fw_cfg_add_file(s, filename, g_byte_array_free(array, TRUE), size); + + return true; } static void fw_cfg_machine_reset(void *opaque) |