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LibC: Return nullptr if allocation fails in strdup() and strndup()

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If allocation would fail, we would continue to UB at memcpy
and nullptr dereference before returning.
This commit is contained in:
Stanisław Wiśniewski 2023-04-15 08:09:22 +02:00 • committed by Andreas Kling
commit 1649138a29
Notes: sideshowbarker 2024-07-17 03:16:02 +09:00
1 changed files with 4 additions and 0 deletions
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4
Userland/Libraries/LibC/string.cpp
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@ -72,6 +72,8 @@ char* strdup(char const* str)
{ {
size_t len = strlen(str); size_t len = strlen(str);
char* new_str = (char*)malloc(len + 1); char* new_str = (char*)malloc(len + 1);
if (!new_str)
return nullptr;
memcpy(new_str, str, len); memcpy(new_str, str, len);
new_str[len] = '\0'; new_str[len] = '\0';
return new_str; return new_str;
@ -82,6 +84,8 @@ char* strndup(char const* str, size_t maxlen)
{ {
size_t len = strnlen(str, maxlen); size_t len = strnlen(str, maxlen);
char* new_str = (char*)malloc(len + 1); char* new_str = (char*)malloc(len + 1);
if (!new_str)
return nullptr;
memcpy(new_str, str, len); memcpy(new_str, str, len);
new_str[len] = 0; new_str[len] = 0;
return new_str; return new_str;