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util/nvmutil: prevent overflow in rw_file_exact

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Signed-off-by: Leah Rowe <leah@libreboot.org>
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Leah Rowe
2026-03-14 17:49:18 +00:00
parent 9ca9b54828
commit b231e28c93
1 changed files with 4 additions and 0 deletions
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util/nvmutil/nvmutil.c
+4
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@@ -1860,6 +1860,10 @@ rw_file_exact(int fd, u8 *mem, size_t nrw,
return -1; return -1;
} }
/* Prevent theoretical overflow */
if (rv > nrw - rc)
goto err_rw_file_exact;
rc += (size_t)rv; rc += (size_t)rv;
} }