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contexts: Forbid cloning/destroying secp256k1_context_static

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This commit is contained in:
Tim Ruffing
2022-12-07 14:38:45 +01:00
parent b1579cf5fb
commit 4b6df5e33e
5 changed files with 88 additions and 24 deletions
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28
src/secp256k1.c
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@@ -109,9 +109,9 @@ size_t secp256k1_context_preallocated_size(unsigned int flags) {
}
size_t secp256k1_context_preallocated_clone_size(const secp256k1_context* ctx) {
size_t ret = sizeof(secp256k1_context);
VERIFY_CHECK(ctx != NULL);
return ret;
ARG_CHECK(secp256k1_context_is_proper(ctx));
return sizeof(secp256k1_context);
}
secp256k1_context* secp256k1_context_preallocated_create(void* prealloc, unsigned int flags) {
@@ -152,6 +152,7 @@ secp256k1_context* secp256k1_context_preallocated_clone(const secp256k1_context*
secp256k1_context* ret;
VERIFY_CHECK(ctx != NULL);
ARG_CHECK(prealloc != NULL);
ARG_CHECK(secp256k1_context_is_proper(ctx));
ret = (secp256k1_context*)prealloc;
*ret = *ctx;
@@ -163,6 +164,8 @@ secp256k1_context* secp256k1_context_clone(const secp256k1_context* ctx) {
size_t prealloc_size;
VERIFY_CHECK(ctx != NULL);
ARG_CHECK(secp256k1_context_is_proper(ctx));
prealloc_size = secp256k1_context_preallocated_clone_size(ctx);
ret = (secp256k1_context*)checked_malloc(&ctx->error_callback, prealloc_size);
ret = secp256k1_context_preallocated_clone(ctx, ret);
@@ -170,17 +173,26 @@ secp256k1_context* secp256k1_context_clone(const secp256k1_context* ctx) {
}
void secp256k1_context_preallocated_destroy(secp256k1_context* ctx) {
ARG_CHECK_VOID(ctx != secp256k1_context_static);
if (ctx != NULL) {
secp256k1_ecmult_gen_context_clear(&ctx->ecmult_gen_ctx);
ARG_CHECK_VOID(ctx == NULL || secp256k1_context_is_proper(ctx));
/* Defined as noop */
if (ctx == NULL) {
return;
}
secp256k1_ecmult_gen_context_clear(&ctx->ecmult_gen_ctx);
}
void secp256k1_context_destroy(secp256k1_context* ctx) {
if (ctx != NULL) {
secp256k1_context_preallocated_destroy(ctx);
free(ctx);
ARG_CHECK_VOID(ctx == NULL || secp256k1_context_is_proper(ctx));
/* Defined as noop */
if (ctx == NULL) {
return;
}
secp256k1_context_preallocated_destroy(ctx);
free(ctx);
}
void secp256k1_context_set_illegal_callback(secp256k1_context* ctx, void (*fun)(const char* message, void* data), const void* data) {