File 0020-cmd-gpt-Address-error-cases-during-.patch of Package u-boot-cubieboard2.25199

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File 0020-cmd-gpt-Address-error-cases-during-.patch of Package u-boot-cubieboard2.25199

From a84f9fbf25678760e6bc4b168812dd72bce8e83c Mon Sep 17 00:00:00 2001
From: Tom Rini <trini@konsulko.com>
Date: Tue, 21 Jan 2020 11:53:38 -0500
Subject: [PATCH] cmd/gpt: Address error cases during gpt rename more correctly

New analysis by the tool has shown that we have some cases where we
weren't handling the error exit condition correctly.  When we ran into
the ENOMEM case we wouldn't exit the function and thus incorrect things
could happen.  Rework the unwinding such that we don't need a helper
function now and free what we may have allocated.

Fixes: 18030d04d25d ("GPT: fix memory leaks identified by Coverity")
Reported-by: Coverity (CID: 275475, 275476)
Cc: Alison Chaiken <alison@she-devel.com>
Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Cc: Jordy <jordy@simplyhacker.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
(cherry picked from commit 5749faa3d6837d6dbaf2119fc3ec49a326690c8f)
Signed-off-by: Matthias Brugger <mbrugger@suse.com>
---
 cmd/gpt.c | 47 ++++++++++++-----------------------------------
 1 file changed, 12 insertions(+), 35 deletions(-)

diff --git a/cmd/gpt.c b/cmd/gpt.c
index 707d861766..0b0a77972d 100644
--- a/cmd/gpt.c
+++ b/cmd/gpt.c
@@ -633,21 +633,6 @@ static int do_disk_guid(struct blk_desc *dev_desc, char * const namestr)
 }
 
 #ifdef CONFIG_CMD_GPT_RENAME
-/*
- * There are 3 malloc() calls in set_gpt_info() and there is no info about which
- * failed.
- */
-static void set_gpt_cleanup(char **str_disk_guid,
-			    disk_partition_t **partitions)
-{
-#ifdef CONFIG_RANDOM_UUID
-	if (str_disk_guid)
-		free(str_disk_guid);
-#endif
-	if (partitions)
-		free(partitions);
-}
-
 static int do_rename_gpt_parts(struct blk_desc *dev_desc, char *subcomm,
 			       char *name1, char *name2)
 {
@@ -655,7 +640,7 @@ static int do_rename_gpt_parts(struct blk_desc *dev_desc, char *subcomm,
 	struct disk_part *curr;
 	disk_partition_t *new_partitions = NULL;
 	char disk_guid[UUID_STR_LEN + 1];
-	char *partitions_list, *str_disk_guid;
+	char *partitions_list, *str_disk_guid = NULL;
 	u8 part_count = 0;
 	int partlistlen, ret, numparts = 0, partnum, i = 1, ctr1 = 0, ctr2 = 0;
 
@@ -697,14 +682,8 @@ static int do_rename_gpt_parts(struct blk_desc *dev_desc, char *subcomm,
 	/* set_gpt_info allocates new_partitions and str_disk_guid */
 	ret = set_gpt_info(dev_desc, partitions_list, &str_disk_guid,
 			   &new_partitions, &part_count);
-	if (ret < 0) {
-		del_gpt_info();
-		free(partitions_list);
-		if (ret == -ENOMEM)
-			set_gpt_cleanup(&str_disk_guid, &new_partitions);
-		else
-			goto out;
-	}
+	if (ret < 0)
+		goto out;
 
 	if (!strcmp(subcomm, "swap")) {
 		if ((strlen(name1) > PART_NAME_LEN) || (strlen(name2) > PART_NAME_LEN)) {
@@ -766,14 +745,8 @@ static int do_rename_gpt_parts(struct blk_desc *dev_desc, char *subcomm,
 	 * Even though valid pointers are here passed into set_gpt_info(),
 	 * it mallocs again, and there's no way to tell which failed.
 	 */
-	if (ret < 0) {
-		del_gpt_info();
-		free(partitions_list);
-		if (ret == -ENOMEM)
-			set_gpt_cleanup(&str_disk_guid, &new_partitions);
-		else
-			goto out;
-	}
+	if (ret < 0)
+		goto out;
 
 	debug("Writing new partition table\n");
 	ret = gpt_restore(dev_desc, disk_guid, new_partitions, numparts);
@@ -795,10 +768,14 @@ static int do_rename_gpt_parts(struct blk_desc *dev_desc, char *subcomm,
 	}
 	printf("new partition table with %d partitions is:\n", numparts);
 	print_gpt_info();
-	del_gpt_info();
  out:
-	free(new_partitions);
-	free(str_disk_guid);
+	del_gpt_info();
+#ifdef CONFIG_RANDOM_UUID
+	if (str_disk_guid)
+		free(str_disk_guid);
+#endif
+	if (new_partitions)
+		free(new_partitions);
 	free(partitions_list);
 	return ret;
 }

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