Commit b0aa931f authored Mar 17, 2014 by Liu ShuoX Committed by Tony Luck Mar 17, 2014

pstore: Fix NULL pointer fault if get NULL prz in ramoops_get_next_prz



ramoops_get_next_prz get the prz according the paramters. If it get a
uninitialized prz, access its members by following persistent_ram_old_size(prz)
will cause a NULL pointer crash.
Ex: if ftrace_size is 0, fprz will be NULL.

Fix it by return NULL in advance.

Signed-off-by: Liu ShuoX <shuox.liu@intel.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>

parent aa9a4a1e

fs/pstore/ram.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -119,6 +119,8 @@ ramoops_get_next_prz(struct persistent_ram_zone przs[], uint c, uint max,
		return NULL;

		prz = przs[i];
		if (!prz)
		return NULL;

		/* Update old/shadowed buffer. */
		if (update)