[PATCH] Check return from argv_split() in do_coredump().

[Tetsuo Handa]

do_coredump() accesses helper_argv[0] without checking helper_argv != NULL.
Though, likely helper_argv != NULL.

Below versions have this problem.

  2.6.24.7
  2.6.25.20
  2.6.26.8
  2.6.27.10
  2.6.28-rc9
  mmotm 2008-12-22-16-14

Signed-off-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
---
 fs/exec.c |    5 +++++
 1 file changed, 5 insertions(+)

--- linux-2.6.28-rc9-mm1.orig/fs/exec.c
+++ linux-2.6.28-rc9-mm1/fs/exec.c
@@ -1809,10 +1809,15 @@ int do_coredump(long signr, int exit_cod
 	if ((!ispipe) && (core_limit < binfmt->min_coredump))
 		goto fail_unlock;
 
  	if (ispipe) {
 		helper_argv = argv_split(GFP_KERNEL, corename+1, &helper_argc);
+		if (!helper_argv) {
+			printk(KERN_WARNING "%s failed to allocate memory\n",
+			       __func__);
+			goto fail_unlock;
+		}
 		/* Terminate the string before the first option */
 		delimit = strchr(corename, ' ');
 		if (delimit)
 			*delimit = '\0';
 		delimit = strrchr(helper_argv[0], '/');
--
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