Commit aa9a4a1e authored Mar 17, 2014 by Liu ShuoX Committed by Tony Luck Mar 17, 2014

pstore: skip zero size persistent ram buffer in traverse

In ramoops_pstore_read, a valid prz pointer with zero size buffer will
break traverse of all persistent ram buffers.  The latter buffer might be
lost.

Signed-off-by: Liu ShuoX <shuox.liu@intel.com>
Cc: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
Cc: Colin Cross <ccross@android.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>

parent 57fd8353

fs/pstore/ram.c

+5 −5

Original line number	Diff line number	Diff line
		@@ -120,12 +120,12 @@ ramoops_get_next_prz(struct persistent_ram_zone przs[], uint c, uint max,

		prz = przs[i];

		if (update) {
		/* Update old/shadowed buffer. */
		if (update)
		persistent_ram_save_old(prz);

		if (!persistent_ram_old_size(prz))
		return NULL;
		}

		*typep = type;
		*id = i;

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