Commit-ID: 092e72c9edab16d4d6ad10c683a95047d53b6db4
Gitweb: https://git.kernel.org/tip/092e72c9edab16d4d6ad10c683a95047d53b6db4
Author: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
AuthorDate: Wed, 25 Oct 2017 11:04:47 +0100
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Wed, 25 Oct 2017 12:10:59 +0200
efi/efi_test: Prevent an Oops in efi_runtime_query_capsulecaps()
If "qcaps.capsule_count" is ULONG_MAX then "qcaps.capsule_count + 1"
will overflow to zero and kcalloc() will return the ZERO_SIZE_PTR. We
try to dereference it inside the loop and crash.
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Acked-by: Ivan Hu <ivan.hu@xxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: linux-efi@xxxxxxxxxxxxxxx
Fixes: ff6301dabc3c ("efi: Add efi_test driver for exporting UEFI runtime service interfaces")
Link: http://lkml.kernel.org/r/20171025100448.26056-2-ard.biesheuvel@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
drivers/firmware/efi/test/efi_test.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/firmware/efi/test/efi_test.c b/drivers/firmware/efi/test/efi_test.c
index 08129b7..41c48a1 100644
--- a/drivers/firmware/efi/test/efi_test.c
+++ b/drivers/firmware/efi/test/efi_test.c
@@ -593,6 +593,9 @@ static long efi_runtime_query_capsulecaps(unsigned long arg)
if (copy_from_user(&qcaps, qcaps_user, sizeof(qcaps)))
return -EFAULT;
+ if (qcaps.capsule_count == ULONG_MAX)
+ return -EINVAL;
+
capsules = kcalloc(qcaps.capsule_count + 1,
sizeof(efi_capsule_header_t), GFP_KERNEL);
if (!capsules)
--
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