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Date: Sun, 5 Nov 2023 23:29:36 +0300
From: Sergey Shtylyov <>
To: Kees Cook <>, Tony Luck <>,
	"Guilherme G. Piccoli" <>,
Subject: [PATCH] pstore: ram_core: fix possible overflow in persistent_ram_init_ecc()

In persistent_ram_init_ecc(), on 64-bit arches DIV_ROUND_UP() will return
64-bit value since persistent_ram_zone::buffer_size has type size_t which
is derived from the 64-bit *unsigned long*, while the ecc_blocks variable
this value gets assigned to has (always 32-bit) *int* type.  Even if that
value fits into *int* type, an overflow is still possible when calculating
the size_t typed ecc_total variable further below since there's no cast to
any 64-bit type before multiplication.  Declaring the ecc_blocks variable
as *unsigned long* should fix this mess...

Found by Linux Verification Center ( with the SVACE static
analysis tool.

Fixes: 9cc05ad97c57 ("staging: android: persistent_ram: refactor ecc support")
Signed-off-by: Sergey Shtylyov <>
The patch is against the 'master' branch of Linus Torvalds' repo.

 fs/pstore/ram_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/pstore/ram_core.c b/fs/pstore/ram_core.c
index 650e437b55e6..131c1923b8c0 100644
--- a/fs/pstore/ram_core.c
+++ b/fs/pstore/ram_core.c
@@ -190,7 +190,7 @@ static int persistent_ram_init_ecc(struct persistent_ram_zone *prz,
 	int numerr;
 	struct persistent_ram_buffer *buffer = prz->buffer;
-	int ecc_blocks;
+	unsigned long ecc_blocks;
 	size_t ecc_total;
 	if (!ecc_info || !ecc_info->ecc_size)

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