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util/nvmutil: use unsigned char in hextonum

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char can be signed or unsigned, and this is often
implementation-defined. this could result in bad
comparisons, so we should specifically cast it.

Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-06 22:08:15 +00:00
parent f57358ac1e
commit 2c2bda31ea
1 changed files with 8 additions and 6 deletions
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util/nvmutil/nvmutil.c
+8 -6
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@@ -512,14 +512,16 @@ set_mac_nib(size_t mac_str_pos, size_t mac_nib_pos)
static uint8_t
hextonum(char mac_ch)
{
if ((unsigned)(mac_ch - '0') <= 9)
return mac_ch - '0';
unsigned char ch = (unsigned char)mac_ch;
mac_ch |= 0x20;
if ((unsigned)(ch - '0') <= 9)
return ch - '0';
if ((unsigned)(mac_ch - 'a') <= 5)
return mac_ch - 'a' + 10;
else if (mac_ch == '?' || mac_ch == 'x')
ch |= 0x20;
if ((unsigned)(ch - 'a') <= 5)
return ch - 'a' + 10;
else if (ch == '?' || ch == 'x')
return rhex(); /* random character */
else
return 16; /* invalid character */