[U-Boot] [PATCH] cmd_mtdparts.c: prevent printbuffer overflows

[Anatolij Gustschin]

The length of configured MTDPARTS_DEFAULT string
could be greather than console printbuffer size.
Check the lenght of the string before printing
to prevent U-Boot crashes.

Signed-off-by: Anatolij Gustschin <agust at denx.de>
---
 common/cmd_mtdparts.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/common/cmd_mtdparts.c b/common/cmd_mtdparts.c
index 230e96e..d4cb194 100644
--- a/common/cmd_mtdparts.c
+++ b/common/cmd_mtdparts.c
@@ -1254,6 +1254,14 @@ static void list_partitions(void)
 	printf("\ndefaults:\n");
 	printf("mtdids  : %s\n",
 		mtdids_default ? mtdids_default : "none");
+
+	/* Check to prevent printbuffer overflows */
+	if (mtdparts_default && strlen(mtdparts_default) > CONFIG_SYS_PBSIZE) {
+		puts("Warning: mtdparts too long,"
+		     " please increase CONFIG_SYS_PBSIZE\n");
+		return;
+	}
+
 	printf("mtdparts: %s\n",
 		mtdparts_default ? mtdparts_default : "none");
 }
-- 
1.6.3.3