env: Check for NULL pointer in envmatch()

If the pointer passed into envmatch() is NULL, return -1 instead of
crashing.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>

diff --git a/common/cmd_nvedit.c b/common/cmd_nvedit.c
index d655ab9..1f9c674 100644 (file)
--- a/common/cmd_nvedit.c
+++ b/common/cmd_nvedit.c
@@ -650,6 +650,9 @@ U_BOOT_CMD(
  */
 int envmatch(uchar *s1, int i2)
 {
+       if (s1 == NULL)
+               return -1;
+
        while (*s1 == env_get_char(i2++))
                if (*s1++ == '=')
                        return i2;

diff --git a/tools/env/fw_env.c b/tools/env/fw_env.c
index 2c607bf..520ce3f 100644 (file)
--- a/tools/env/fw_env.c
+++ b/tools/env/fw_env.c
@@ -1057,6 +1057,8 @@ exit:
 
 static char *envmatch (char * s1, char * s2)
 {
+       if (s1 == NULL || s2 == NULL)
+               return NULL;
 
        while (*s1 == *s2++)
                if (*s1++ == '=')