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image: Fix potentially uninitialized data variable

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In case fitImage support is disabled, and image_locate_script() is
passed a fitImage, then the 'data' variable is used uninitialized.
Drop into the default: branch of the switch-case statement and do
not return the uninitialized data, and do not modify the return
pointer either, just print an error message.

Reported by clang build:
"
$ make HOSTCC=clang CC=clang KCFLAGS=-Werror sandbox64_defconfig && make HOSTCC=clang CC=clang KCFLAGS=-Werror
...
boot/image-board.c:1006:7: error: variable 'data' is used uninitialized whenever switch case is taken [-Werror,-Wsometimes-uninitialized]
        case IMAGE_FORMAT_LEGACY:
             ^~~~~~~~~~~~~~~~~~~
include/image.h:608:29: note: expanded from macro 'IMAGE_FORMAT_LEGACY'
                                ^~~~
boot/image-board.c:1128:19: note: uninitialized use occurs here
        *datap = (char *)data;
                         ^~~~
boot/image-board.c:1001:11: note: initialize the variable 'data' to silence this warning
        u32 *data;
                 ^
                  = NULL
"

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Marek Vasut 2023-02-27 20:56:31 +01:00 committed by Tom Rini
parent 00491a30b1
commit 771cb4d58b
1 changed files with 11 additions and 4 deletions
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15
boot/image-board.c
View file

@ -1004,7 +1004,9 @@ int image_locate_script(void *buf, int size, const char *fit_uname,
switch (genimg_get_format(buf)) {
case IMAGE_FORMAT_LEGACY:
if (IS_ENABLED(CONFIG_LEGACY_IMAGE_FORMAT)) {
if (!IS_ENABLED(CONFIG_LEGACY_IMAGE_FORMAT)) {
goto exit_image_format;
} else {
hdr = buf;
if (!image_check_magic(hdr)) {
@ -1047,7 +1049,9 @@ int image_locate_script(void *buf, int size, const char *fit_uname,
}
break;
case IMAGE_FORMAT_FIT:
if (IS_ENABLED(CONFIG_FIT)) {
if (!IS_ENABLED(CONFIG_FIT)) {
goto exit_image_format;
} else {
fit_hdr = buf;
if (fit_check_format(fit_hdr, IMAGE_SIZE_INVAL)) {
puts("Bad FIT image format\n");
@ -1121,12 +1125,15 @@ fallback:
}
break;
default:
puts("Wrong image format for \"source\" command\n");
return -EPERM;
goto exit_image_format;
}
*datap = (char *)data;
*lenp = len;
return 0;
exit_image_format:
puts("Wrong image format for \"source\" command\n");
return -EPERM;
}