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From: Jan Remmet <j.remmet@phytec.de>
To: barebox@lists.infradead.org
Subject: [PATCH] common: state: check length
Date: Tue, 21 May 2019 16:44:13 +0200	[thread overview]
Message-ID: <1558449853-28519-1-git-send-email-j.remmet@phytec.de> (raw)

if written_length is read from a partial written bucket it may be to
big and xmalloc will panic barebox.

Check if the value is sane.

Signed-off-by: Jan Remmet <j.remmet@phytec.de>
---
 common/state/backend_bucket_direct.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/common/state/backend_bucket_direct.c b/common/state/backend_bucket_direct.c
index 95ddb9310685..fc633eea8dec 100644
--- a/common/state/backend_bucket_direct.c
+++ b/common/state/backend_bucket_direct.c
@@ -67,6 +67,10 @@ static int state_backend_bucket_direct_read(struct state_backend_storage_bucket
 	}
 	if (meta.magic == direct_magic) {
 		read_len = meta.written_length;
+		if (read_len < 0 || read_len > direct->max_size) {
+			dev_err(direct->dev, "Wrong length in meta data\n");
+			return -EINVAL;
+		}
 	} else {
 		if (meta.magic != ~0 && !!meta.magic)
 			bucket->wrong_magic = 1;
-- 
2.7.4


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             reply	other threads:[~2019-05-21 14:44 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-21 14:44 Jan Remmet [this message]
2019-05-23  6:57 ` Sascha Hauer
2019-05-23  7:49   ` [PATCH v2] " Jan Remmet
2019-05-23  8:00     ` Sascha Hauer

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