Commit-ID: b8cb62f82103083a6e8fa5470bfe634a2c06514d Gitweb: http://git.kernel.org/tip/b8cb62f82103083a6e8fa5470bfe634a2c06514d Author: Ben Hutchings <ben@xxxxxxxxxxxxxxx> AuthorDate: Sun, 16 Jun 2013 21:27:12 +0100 Committer: Matt Fleming <matt.fleming@xxxxxxxxx> CommitDate: Fri, 21 Jun 2013 10:52:49 +0100 x86/efi: Fix dummy variable buffer allocation 1. Check for allocation failure 2. Clear the buffer contents, as they may actually be written to flash 3. Don't leak the buffer Compile-tested only. [ Tested successfully on my buggy ASUS machine - Matt ] Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Matt Fleming <matt.fleming@xxxxxxxxx> --- arch/x86/platform/efi/efi.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c index 5ae2eb0..d2fbced 100644 --- a/arch/x86/platform/efi/efi.c +++ b/arch/x86/platform/efi/efi.c @@ -1069,7 +1069,10 @@ efi_status_t efi_query_variable_store(u32 attributes, unsigned long size) * that by attempting to use more space than is available. */ unsigned long dummy_size = remaining_size + 1024; - void *dummy = kmalloc(dummy_size, GFP_ATOMIC); + void *dummy = kzalloc(dummy_size, GFP_ATOMIC); + + if (!dummy) + return EFI_OUT_OF_RESOURCES; status = efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID, EFI_VARIABLE_NON_VOLATILE | @@ -1089,6 +1092,8 @@ efi_status_t efi_query_variable_store(u32 attributes, unsigned long size) 0, dummy); } + kfree(dummy); + /* * The runtime code may now have triggered a garbage collection * run, so check the variable info again -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
|