jose: prevent memory leaks when zlib compressing (deflate) fails

in oidc_jose_zlib_compress

Signed-off-by: Hans Zandbelt <[email protected]>

Author: zandbelt

ChangeLog

@@ -1,3 +1,6 @@
+01/19/2025
+- jose: prevent memory leaks when zlib compressing (deflate) fails in oidc_jose_zlib_compress
+
 01/02/2025
 - add a configuration check for public/private keys when using DPoP; closes #1293; thanks @ahus1
 - update copyright year to 2025

src/jose.c

@@ -969,6 +969,7 @@ static apr_byte_t oidc_jose_brotli_uncompress(apr_pool_t *pool, const char *inpu
  */
 static apr_byte_t oidc_jose_zlib_compress(apr_pool_t *pool, const char *input, int input_len, char **output,
 					  int *output_len, oidc_jose_error_t *err) {
+	apr_byte_t rv = FALSE;
 	int status = Z_OK;
 	z_stream zlib;
 
@@ -985,24 +986,24 @@ static apr_byte_t oidc_jose_zlib_compress(apr_pool_t *pool, const char *input, i
 	status = deflateInit(&zlib, Z_BEST_COMPRESSION);
 	if (status != Z_OK) {
 		oidc_jose_error(err, "deflateInit() failed: %d", status);
-		return FALSE;
+		goto end;
 	}
 
 	status = deflate(&zlib, Z_FINISH);
 	if (status != Z_STREAM_END) {
 		oidc_jose_error(err, "deflate() failed: %d", status);
-		return FALSE;
-	}
-
-	status = deflateEnd(&zlib);
-	if (status != Z_OK) {
-		oidc_jose_error(err, "deflateEnd() failed: %d", status);
-		return FALSE;
+		goto end;
 	}
 
 	*output_len = (int)zlib.total_out;
 
-	return TRUE;
+	rv = TRUE;
+
+end:
+
+	deflateEnd(&zlib);
+
+	return rv;
 }
 
 #define OIDC_CJOSE_UNCOMPRESS_CHUNK 8192
@@ -1012,6 +1013,7 @@ static apr_byte_t oidc_jose_zlib_compress(apr_pool_t *pool, const char *input, i
  */
 static apr_byte_t oidc_jose_zlib_uncompress(apr_pool_t *pool, const char *input, int input_len, char **output,
 					    int *output_len, oidc_jose_error_t *err) {
+	apr_byte_t rv = FALSE;
 	int status = Z_OK;
 	size_t len = OIDC_CJOSE_UNCOMPRESS_CHUNK;
 	char *tmp = NULL, *buf = apr_pcalloc(pool, len);
@@ -1027,7 +1029,7 @@ static apr_byte_t oidc_jose_zlib_uncompress(apr_pool_t *pool, const char *input,
 	status = inflateInit(&zlib);
 	if (status != Z_OK) {
 		oidc_jose_error(err, "inflateInit() failed: %d", status);
-		return FALSE;
+		goto end;
 	}
 
 	while (status == Z_OK) {
@@ -1044,20 +1046,19 @@ static apr_byte_t oidc_jose_zlib_uncompress(apr_pool_t *pool, const char *input,
 
 	if (status != Z_STREAM_END) {
 		oidc_jose_error(err, "inflate() failed: %d", status);
-		inflateEnd(&zlib);
-		return FALSE;
-	}
-
-	status = inflateEnd(&zlib);
-	if (status != Z_OK) {
-		oidc_jose_error(err, "inflateEnd() failed: %d", status);
-		return FALSE;
+		goto end;
 	}
 
 	*output_len = (int)zlib.total_out;
 	*output = buf;
 
-	return TRUE;
+	rv = TRUE;
+
+end:
+
+	inflateEnd(&zlib);
+
+	return rv;
 }
 
 #endif