at91sam7: ensure probed flash bank has a name (fix a segfault)

Before this commit, openocd used to segfault when probing flash
of an at91sam7x512 (which contains 2 banks of flash). This was due
to the way it systematically insert a new flash bank without setting
its name.
Then, when get_flash_bank_by_name_noprobe() is called, it is doing
a strcmp() on the non-initialized bank->name.

This commit prevents allocation of second probed bank if it is already
allocated (for example, if it is set in a target config file). If a
new bank really needs to be allocated, it ensures that a default name
is set.

Change-Id: I38d15bef1fda2ec746efad37171975136cf7b371
Signed-off-by: Aurelien Jacobs <aurel@gnuage.org>
Reviewed-on: http://openocd.zylin.com/171
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

1 files changed, 26 insertions, 20 deletions

diff --git a/src/flash/nor/at91sam7.c b/src/flash/nor/at91sam7.c
index 67e383a3..74d9ba3d 100644
--- a/src/flash/nor/at91sam7.c
+++ b/src/flash/nor/at91sam7.c
@@ -622,16 +622,19 @@ static int at91sam7_read_part_info(struct flash_bank *bank)
 	{
 		if (bnk > 0)
 		{
-			/* create a new flash bank element */
-			struct flash_bank *fb = malloc(sizeof(struct flash_bank));
-			fb->target = target;
-			fb->driver = bank->driver;
-			fb->driver_priv = malloc(sizeof(struct at91sam7_flash_bank));
-			fb->next = NULL;
-
-			/* link created bank in 'flash_banks' list and redirect t_bank */
-			t_bank->next = fb;
-			t_bank = fb;
+			if (!t_bank->next) {
+				/* create a new flash bank element */
+				struct flash_bank *fb = malloc(sizeof(struct flash_bank));
+				fb->target = target;
+				fb->driver = bank->driver;
+				fb->driver_priv = malloc(sizeof(struct at91sam7_flash_bank));
+				fb->name = "sam7_probed";
+				fb->next = NULL;
+
+				/* link created bank in 'flash_banks' list */
+				t_bank->next = fb;
+			}
+			t_bank = t_bank->next;
 		}
 
 		t_bank->bank_number = bnk;
@@ -875,16 +878,19 @@ FLASH_BANK_COMMAND_HANDLER(at91sam7_flash_bank_command)
 	{
 		if (bnk > 0)
 		{
-			/* create a new bank element */
-			struct flash_bank *fb = malloc(sizeof(struct flash_bank));
-			fb->target = target;
-			fb->driver = bank->driver;
-			fb->driver_priv = malloc(sizeof(struct at91sam7_flash_bank));
-			fb->next = NULL;
-
-			/* link created bank in 'flash_banks' list and redirect t_bank */
-			t_bank->next = fb;
-			t_bank = fb;
+			if (!t_bank->next) {
+				/* create a new bank element */
+				struct flash_bank *fb = malloc(sizeof(struct flash_bank));
+				fb->target = target;
+				fb->driver = bank->driver;
+				fb->driver_priv = malloc(sizeof(struct at91sam7_flash_bank));
+				fb->name = "sam7_probed";
+				fb->next = NULL;
+
+				/* link created bank in 'flash_banks' list */
+				t_bank->next = fb;
+			}
+			t_bank = t_bank->next;
 		}
 
 		t_bank->bank_number = bnk;