image: Avoid erroneous double byte-swap in CRC value
The hash algorithm selection was streamlined in commit 92055e138f28
("image: Drop if/elseif hash selection in calculate_hash()"). Said
commit kept the call to cpu_to_uimage() to convert the CRC to big
endian format.
This would have been correct when calling crc32_wd(). However, the
->hash_func_ws member of crc32 points to crc32_wd_buf(), which already
converts the CRC to big endian. On a little endian host, doing both
conversions results in a little-endian CRC. This is incorrect.
To remedy this, simply drop the call to cpu_to_uimage(), thus only
doing the byte-order conversion once.
Fixes: 92055e138f28 ("image: Drop if/elseif hash selection in
calculate_hash()")
Tested-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
diff --git a/common/image-fit.c b/common/image-fit.c
index 92d9141..f02d437 100644
--- a/common/image-fit.c
+++ b/common/image-fit.c
@@ -1193,12 +1193,6 @@
return 0;
}
-static void crc32_uimage_fixup(void *value)
-{
- /* TODO: In C, this type punning is undefined behavior: */
- *((uint32_t *)value) = cpu_to_uimage(*((uint32_t *)value));
-}
-
/**
* calculate_hash - calculate and return hash for provided input data
* @data: pointer to the input data
@@ -1232,9 +1226,6 @@
algo->hash_func_ws(data, data_len, value, algo->chunk_size);
*value_len = algo->digest_size;
- if (!strcmp(name, "crc32"))
- crc32_uimage_fixup(value);
-
return 0;
}