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hw/core/loader-fit: Fix missing ERRP_GUARD() for error_prepend()

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As the comment in qapi/error, passing @errp to error_prepend() requires
ERRP_GUARD():

* = Why, when and how to use ERRP_GUARD() =
*
* Without ERRP_GUARD(), use of the @errp parameter is restricted:
...
* - It should not be passed to error_prepend(), error_vprepend() or
*   error_append_hint(), because that doesn't work with &error_fatal.
* ERRP_GUARD() lifts these restrictions.
*
* To use ERRP_GUARD(), add it right at the beginning of the function.
* @errp can then be used without worrying about the argument being
* NULL or &error_fatal.

ERRP_GUARD() could avoid the case when @errp is &error_fatal, the user
can't see this additional information, because exit() happens in
error_setg earlier than information is added [1].

In hw/core/loader-fit.c, there are 2 functions passing @errp to
error_prepend() without ERRP_GUARD():
 - fit_load_kernel()
 - fit_load_fdt()

Their @errp parameters are both the pointers of the local @err virable
in load_fit().

Though they don't cause the issue like [1] said, to follow the
requirement of @errp, add missing ERRP_GUARD() at their beginning.

[1]: Issue description in the commit message of commit ae7c80a7bd73
     ("error: New macro ERRP_GUARD()").

Cc: Paul Burton <paulburton@kernel.org>
Cc: Aleksandar Rikalo <aleksandar.rikalo@syrmia.com>
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Message-ID: <20240311033822.3142585-15-zhao1.liu@linux.intel.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
This commit is contained in:
Zhao Liu 2024-03-11 11:38:07 +08:00 committed by Philippe Mathieu-Daudé
parent d36b2f4e78
commit bfd65b4ba5
1 changed files with 2 additions and 0 deletions
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2
hw/core/loader-fit.c
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@ -120,6 +120,7 @@ static int fit_load_kernel(const struct fit_loader *ldr, const void *itb,
int cfg, void *opaque, hwaddr *pend,
Error **errp)
{
ERRP_GUARD();
const char *name;
const void *data;
const void *load_data;
@ -178,6 +179,7 @@ static int fit_load_fdt(const struct fit_loader *ldr, const void *itb,
int cfg, void *opaque, const void *match_data,
hwaddr kernel_end, Error **errp)
{
ERRP_GUARD();
Error *err = NULL;
const char *name;
const void *data;