From: Manas <ghandatmanas@gmail.com>
To: davem@davemloft.net, herbert@gondor.apana.org.au
Cc: linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org,
stable@vger.kernel.org, Manas <ghandatmanas@gmail.com>,
Rakshit Awasthi <rakshitawasthi17@gmail.com>
Subject: [PATCH] Crypto : Fix Null deref in scatterwalk_pagedone
Date: Sat, 21 Feb 2026 20:40:41 +0530 [thread overview]
Message-ID: <20260221151041.65141-1-ghandatmanas@gmail.com> (raw)
`sg_next` can return NULL which causes NULL deref in
`scatterwalk_start`
Reported-by: Manas Ghandat <ghandatmanas@gmail.com>
Reported-by: Rakshit Awasthi <rakshitawasthi17@gmail.com>
Signed-off-by: Manas Ghandat <ghandatmanas@gmail.com>
Signed-off-by: Rakshit Awasthi <rakshitawasthi17@gmail.com>
---
include/crypto/scatterwalk.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/include/crypto/scatterwalk.h b/include/crypto/scatterwalk.h
index 32fc4473175b..abbb67391710 100644
--- a/include/crypto/scatterwalk.h
+++ b/include/crypto/scatterwalk.h
@@ -78,7 +78,8 @@ static inline void scatterwalk_pagedone(struct scatter_walk *walk, int out,
page = sg_page(walk->sg) + ((walk->offset - 1) >> PAGE_SHIFT);
flush_dcache_page(page);
}
-
+ if (sg_next(walk->sg) == NULL)
+ return;
if (more && walk->offset >= walk->sg->offset + walk->sg->length)
scatterwalk_start(walk, sg_next(walk->sg));
}
--
2.43.0
next reply other threads:[~2026-02-21 15:11 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-21 15:10 Manas [this message]
2026-02-21 16:46 ` [PATCH] Crypto : Fix Null deref in scatterwalk_pagedone Greg KH
2026-02-21 18:39 ` Eric Biggers
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