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swap alloca for malloc

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This commit is contained in:
Alba Mendez
2023-03-16 10:58:12 +01:00
parent 76e267968d
commit 8c8116724e
1 changed files with 8 additions and 1 deletions
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9
virtualsmartcard/src/vpcd/vpcd.c
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@@ -226,8 +226,14 @@ static ssize_t sendToVICC(struct vicc_ctx *ctx, size_t length, const unsigned ch
return -1; return -1;
} }
/* allocate buffer for outgoing message */
sendBuffer = (char *) malloc(length + 2);
if (sendBuffer == NULL) {
errno = ENOMEM;
return -1;
}
/* send size of message on 2 bytes */ /* send size of message on 2 bytes */
sendBuffer = (char *) alloca(length + 2);
size = htons((uint16_t) length); size = htons((uint16_t) length);
memcpy(sendBuffer, &size, 2); memcpy(sendBuffer, &size, 2);
memcpy(sendBuffer + 2, buffer, length); memcpy(sendBuffer + 2, buffer, length);
@@ -236,6 +242,7 @@ static ssize_t sendToVICC(struct vicc_ctx *ctx, size_t length, const unsigned ch
if (r < 0) if (r < 0)
vicc_eject(ctx); vicc_eject(ctx);
free(sendBuffer);
return r; return r;
} }