diff options
| author | Justin Stitt <[email protected]> | 2024-08-08 21:43:56 +0000 |
|---|---|---|
| committer | Kees Cook <[email protected]> | 2024-08-15 16:26:02 +0000 |
| commit | bbf3c7ff9dfa45be51500d23a1276991a7cd8c6e (patch) | |
| tree | 0f9f1877cc36c3ecc72bad4ae289b4238c3c872f /lib/string_helpers.c | |
| parent | coccinelle: Add rules to find str_down_up() replacements (diff) | |
| download | kernel-bbf3c7ff9dfa45be51500d23a1276991a7cd8c6e.tar.gz kernel-bbf3c7ff9dfa45be51500d23a1276991a7cd8c6e.zip | |
lib/string_helpers: rework overflow-dependent code
When @size is 0, the desired behavior is to allow unlimited bytes to be
parsed. Currently, this relies on some intentional arithmetic overflow
where --size gives us SIZE_MAX when size is 0.
Explicitly spell out the desired behavior without relying on intentional
overflow/underflow.
Signed-off-by: Justin Stitt <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Kees Cook <[email protected]>
Diffstat (limited to 'lib/string_helpers.c')
| -rw-r--r-- | lib/string_helpers.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/string_helpers.c b/lib/string_helpers.c index 69ba49b853c7..4f887aa62fa0 100644 --- a/lib/string_helpers.c +++ b/lib/string_helpers.c @@ -321,6 +321,9 @@ int string_unescape(char *src, char *dst, size_t size, unsigned int flags) { char *out = dst; + if (!size) + size = SIZE_MAX; + while (*src && --size) { if (src[0] == '\\' && src[1] != '\0' && size > 1) { src++; |