[PATCH] fix potential null deref in kallsyms::read_symbol

[Jesper Juhl <jesper.juhl@gmail.com>]

The Coverity checker found that if malloc() fails in 
scripts/kallsyms.c::read_symbol() then we end up dereferencing a NULL pointer.

Unlikely to happen, but we really should check the malloc() return value.
This patch fixes the problem by checking the return value and printing a nice
descriptive error message and exiting if malloc() did fail.

This fixes coverity error #397


Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
---

 scripts/kallsyms.c |    5 +++++
 1 files changed, 5 insertions(+)

--- linux-2.6.16-rc5-git12-orig/scripts/kallsyms.c	2006-01-03 04:21:10.000000000 +0100
+++ linux-2.6.16-rc5-git12/scripts/kallsyms.c	2006-03-09 22:57:13.000000000 +0100
@@ -124,6 +124,11 @@ static int read_symbol(FILE *in, struct 
 	 * compressed together */
 	s->len = strlen(str) + 1;
 	s->sym = malloc(s->len + 1);
+	if (!s->sym) {
+		fprintf(stderr, "kallsyms failure: "
+			"unable to allocate required amount of memory\n");
+		exit(EXIT_FAILURE);
+	}
 	strcpy((char *)s->sym + 1, str);
 	s->sym[0] = stype;