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efi: Fix handling error value in fdt_find_uefi_params 

of_get_flat_dt_subnode_by_name can return negative value in case of error.
Assigning the result to unsigned variable and checking if the variable
is lesser than zero is incorrect and always false.
The patch fixes it by using signed variable to check the result.

The problem has been detected using semantic patch
scripts/coccinelle/tests/unsigned_lesser_than_zero.cocci

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Shawn Lin <shawn.lin@rock-chips.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
This commit is contained in:
Andrzej Hajda 2016-08-30 12:41:37 +02:00 committed by Matt Fleming
parent d4c4fed08f
commit 4af9ed578a
1 changed files with 5 additions and 2 deletions
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7
drivers/firmware/efi/efi.c
View File

@ -657,9 +657,12 @@ static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
}
if (subnode) {
node = of_get_flat_dt_subnode_by_name(node, subnode);
if (node < 0)
int err = of_get_flat_dt_subnode_by_name(node, subnode);
if (err < 0)
return 0;
node = err;
}
return __find_uefi_params(node, info, dt_params[i].params);