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efi: check name length before indexing #212

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efi: check name length before indexing #212

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2 changes: 2 additions & 0 deletions src/efi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,8 @@ select_var_names_by_prefix(const efi_guid_t *guid, const char *prefix,
efi_guid_t global = EFI_GLOBAL_GUID;
size_t plen = strlen(prefix);
const char *num = name + plen;
if (strlen(name) < plen + 4)
return 0;
if (!strncmp(name, prefix, plen) &&
isxdigit(num[0]) && isxdigit(num[1]) &&
isxdigit(num[2]) && isxdigit(num[3]) &&
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