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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 *size_t* should fix this mess...

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

Fixes: 9cc05ad97c ("staging: android: persistent_ram: refactor ecc support")
Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Link: https://lore.kernel.org/r/20231105202936.25694-1-s.shtylyov@omp.ru
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Sergey Shtylyov 2023-11-05 23:29:36 +03:00 committed by Kees Cook
parent d49270a046
commit 86222a8fc1
1 changed files with 1 additions and 1 deletions
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2
fs/pstore/ram_core.c
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@ -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;
size_t ecc_blocks;
size_t ecc_total;
if (!ecc_info || !ecc_info->ecc_size)