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util/nvmutil: mitigate buggy libc i/o

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Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-12 16:34:33 +00:00
parent 303c382eae
commit ab9ee73350
1 changed files with 6 additions and 0 deletions
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util/nvmutil/nvmutil.c
+6
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@@ -1480,6 +1480,12 @@ read_again:
* cause an overflow. Specifications guarantee * cause an overflow. Specifications guarantee
* this won't happen, but spec != implementation * this won't happen, but spec != implementation
*/ */
if ((size_t)rv > SSIZE_MAX) {
errno = EIO;
return -1;
/* we will not tolerate your buggy libc */
}
if ((size_t)rv > (len - rc) /* Prevent overflow */ if ((size_t)rv > (len - rc) /* Prevent overflow */
|| rv == 0) { /* Prevent infinite 0-byte loop */ || rv == 0) { /* Prevent infinite 0-byte loop */
if (rv == 0) { if (rv == 0) {