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[v2] scsi: elx: efct: Cast an operand to u64 to prevent potential u32 overflow in efct_efclib_config()

Message ID 20241021051738.17667-1-zichenxie0106@gmail.com (mailing list archive)
State New
Headers show
Series [v2] scsi: elx: efct: Cast an operand to u64 to prevent potential u32 overflow in efct_efclib_config() | expand

Commit Message

Gax-c Oct. 21, 2024, 5:17 a.m. UTC 
From: Zichen Xie <zichenxie0106@gmail.com>

This was found by a static analyzer.
There may be a potential integer overflow issue in
efct_efclib_config(). efc->max_xfer_size is defined
as "u64" while sli->sge_supported_length and
sli_get_max_sgl(&efct->hw.sli) are all "u32".
The result of the calculation will be limited to
"u32" without correct casting.
We recommend adding an extra cast to prevent
potential integer overflow.

Fixes: 4df84e846624 ("scsi: elx: efct: Driver initialization routines")
Signed-off-by: Zichen Xie <zichenxie0106@gmail.com>
---
v2: adjust subject title.
---
 drivers/scsi/elx/efct/efct_driver.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/scsi/elx/efct/efct_driver.c b/drivers/scsi/elx/efct/efct_driver.c
index 55d2301bfd7d..7fe180037c2d 100644
--- a/drivers/scsi/elx/efct/efct_driver.c
+++ b/drivers/scsi/elx/efct/efct_driver.c
@@ -109,7 +109,7 @@  efct_efclib_config(struct efct *efct, struct libefc_function_template *tt)
 	efc->log_level = EFC_LOG_LIB;
 
 	sli = &efct->hw.sli;
-	efc->max_xfer_size = sli->sge_supported_length *
+	efc->max_xfer_size = (u64)sli->sge_supported_length *
 			     sli_get_max_sgl(&efct->hw.sli);
 	efc->sli = sli;
 	efc->fcfi = efct->hw.fcf_indicator;