coja/lbmk
1
0
Fork 0
mirror of https://codeberg.org/libreboot/lbmk.git synced 2026-07-11 05:52:36 +02:00
Code Issues Packages Projects Releases Wiki Activity

util/nvmutil: safer calculated_checksum

Browse Source 
we rely on uint16_t wrapping, but some platforms may
behave weirdly.

cast as uint32_t and then cast back, on return, with
an explicit mask beforehand.

Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-09 17:07:53 +00:00
parent 61015dbc6c
commit 8f719f80b8
1 changed files with 3 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
util/nvmutil/nvmutil.c
+3 -3
View File
@@ -1132,12 +1132,12 @@ static uint16_t
calculated_checksum(size_t p)
{
size_t c;
uint16_t val16 = 0;
uint32_t val16 = 0;
for (c = 0; c < NVM_CHECKSUM_WORD; c++)
val16 += nvm_word(c, p);
val16 += (uint32_t)nvm_word(c, p);
return NVM_CHECKSUM - val16;
return (uint16_t)((NVM_CHECKSUM - val16) & 0xffff);
}
/*