The checking condition in 'validateFlash2xReadWrite()' is not
sufficient. A large number invalid would cause an integer overflow and
pass the condition, which could cause further integer overflows in
'Bcmchar.c:bcm_char_ioctl()'.
Signed-off-by: Wenliang Fan <fanwle...@gmail.com>
---
drivers/staging/bcm/nvm.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/staging/bcm/nvm.c b/drivers/staging/bcm/nvm.c
index 9e5f955..7f3dd4b 100644
--- a/drivers/staging/bcm/nvm.c
+++ b/drivers/staging/bcm/nvm.c
@@ -3944,6 +3944,11 @@ int validateFlash2xReadWrite(struct bcm_mini_adapter
*Adapter, struct bcm_flash2
BCM_DEBUG_PRINT(Adapter, DBG_TYPE_OTHERS, NVM_RW, DBG_LVL_ALL, "End
offset :%x\n", uiSectEndOffset);
+ /* psFlash2xReadWrite->offset and uiNumOfBytes are user controlled and
can lead to integer overflows */
+ if (uiSectStartOffset + psFlash2xReadWrite->offset < uiSectStartOffset)
+ return false;
+ if (uiSectStartOffset + psFlash2xReadWrite->offset + uiNumOfBytes <
uiNumOfBytes)
+ return false;
/* Checking the boundary condition */
if ((uiSectStartOffset + psFlash2xReadWrite->offset + uiNumOfBytes) <=
uiSectEndOffset)
return TRUE;
--
1.8.5.rc1.28.g7061504
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