From fc46d4e453f50d2b376267f180cae250b54f9fb4 Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Tue, 15 Nov 2016 16:29:40 -0800 Subject: [PATCH] ramoops: add pdata NULL check to ramoops_probe This adds a check for a NULL platform data, which should only be possible if a driver incorrectly sets up a probe request without also having defined the platform_data structure. This is based on a patch from Geliang Tang. Signed-off-by: Kees Cook --- fs/pstore/ram.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c index 380222432eff..27c059e1760a 100644 --- a/fs/pstore/ram.c +++ b/fs/pstore/ram.c @@ -734,11 +734,20 @@ static int ramoops_probe(struct platform_device *pdev) goto fail_out; } - /* Only a single ramoops area allowed at a time, so fail extra + /* + * Only a single ramoops area allowed at a time, so fail extra * probes. */ - if (cxt->max_dump_cnt) + if (cxt->max_dump_cnt) { + pr_err("already initialized\n"); goto fail_out; + } + + /* Make sure we didn't get bogus platform data pointer. */ + if (!pdata) { + pr_err("NULL platform data\n"); + goto fail_out; + } if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size && !pdata->ftrace_size && !pdata->pmsg_size)) { -- 2.20.1