linux-kernel - [PATCH 7/7] Handle snprintf truncation more graceful in thunderx

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Date:   Wed, 11 Oct 2017 10:28:41 +0200
From:   Eric Sesterhenn <eric.sesterhenn@...-dsec.de>
To:     linux-kernel@...r.kernel.org
Subject: [PATCH 7/7] Handle snprintf truncation more graceful in thunderx_edac


When snprintf truncates the string, size might underflow
causing a WARN_ON_ONCE in the snprintf in the next iteration.

Signed-off-by: Eric Sesterhenn <eric.sesterhenn@...-dsec.de>
---
 drivers/edac/thunderx_edac.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/edac/thunderx_edac.c b/drivers/edac/thunderx_edac.c
index f35d87519a3e..aedf3412f38c 100644
--- a/drivers/edac/thunderx_edac.c
+++ b/drivers/edac/thunderx_edac.c
@@ -59,6 +59,8 @@ static void decode_register(char *str, size_t size,
 				       descr->type == ERR_CORRECTED ?
 					 "Corrected" : "Uncorrected",
 				       descr->descr);
+			if (ret > size)
+				return;
 			str += ret;
 			size -= ret;
 		}
-- 
Eric Sesterhenn (Principal Security Consultant)
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T: +49 241 9809418-0, Fax: -9
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