From 7ce4c8f752bc0da682acbda6457d6543ad5d0069 Mon Sep 17 00:00:00 2001 From: Jeff King Date: Fri, 14 Apr 2023 17:25:20 -0400 Subject: v0 protocol: use size_t for capability length/offset When parsing server capabilities, we use "int" to store lengths and offsets. At first glance this seems like a spot where our parser may be confused by integer overflow if somebody sent us a malicious response. In practice these strings are all bounded by the 64k limit of a pkt-line, so using "int" is OK. However, it makes the code simpler to audit if they just use size_t everywhere. Note that because we take these parameters as pointers, this also forces many callers to update their declared types. Signed-off-by: Jeff King Signed-off-by: Junio C Hamano --- connect.c | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-) (limited to 'connect.c') diff --git a/connect.c b/connect.c index b7ba5f5727..c54adc652f 100644 --- a/connect.c +++ b/connect.c @@ -22,7 +22,7 @@ static char *server_capabilities_v1; static struct strvec server_capabilities_v2 = STRVEC_INIT; -static const char *next_server_feature_value(const char *feature, int *len, int *offset); +static const char *next_server_feature_value(const char *feature, size_t *len, size_t *offset); static int check_ref(const char *name, unsigned int flags) { @@ -205,10 +205,10 @@ reject: static void annotate_refs_with_symref_info(struct ref *ref) { struct string_list symref = STRING_LIST_INIT_DUP; - int offset = 0; + size_t offset = 0; while (1) { - int len; + size_t len; const char *val; val = next_server_feature_value("symref", &len, &offset); @@ -231,7 +231,7 @@ static void annotate_refs_with_symref_info(struct ref *ref) static void process_capabilities(struct packet_reader *reader, int *linelen) { const char *feat_val; - int feat_len; + size_t feat_len; const char *line = reader->line; int nul_location = strlen(line); if (nul_location == *linelen) @@ -596,10 +596,10 @@ struct ref **get_remote_refs(int fd_out, struct packet_reader *reader, return list; } -const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp, int *offset) +const char *parse_feature_value(const char *feature_list, const char *feature, size_t *lenp, size_t *offset) { const char *orig_start = feature_list; - int len; + size_t len; if (!feature_list) return NULL; @@ -623,7 +623,7 @@ const char *parse_feature_value(const char *feature_list, const char *feature, i } /* feature with a value (e.g., "agent=git/1.2.3") */ else if (*value == '=') { - int end; + size_t end; value++; end = strcspn(value, " \t\n"); @@ -645,8 +645,8 @@ const char *parse_feature_value(const char *feature_list, const char *feature, i int server_supports_hash(const char *desired, int *feature_supported) { - int offset = 0; - int len; + size_t offset = 0; + size_t len; const char *hash; hash = next_server_feature_value("object-format", &len, &offset); @@ -670,12 +670,12 @@ int parse_feature_request(const char *feature_list, const char *feature) return !!parse_feature_value(feature_list, feature, NULL, NULL); } -static const char *next_server_feature_value(const char *feature, int *len, int *offset) +static const char *next_server_feature_value(const char *feature, size_t *len, size_t *offset) { return parse_feature_value(server_capabilities_v1, feature, len, offset); } -const char *server_feature_value(const char *feature, int *len) +const char *server_feature_value(const char *feature, size_t *len) { return parse_feature_value(server_capabilities_v1, feature, len, NULL); } -- cgit v1.2.3