This is a note to let you know that I've just added the patch titled
powerpc: Fix bad NULL pointer check in udbg_uart_getc_poll()
to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-fix-bad-null-pointer-check-in-udbg_uart_getc_poll.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From cd32e2dcc9de6c27ecbbfc0e2079fb64b42bad5f Mon Sep 17 00:00:00 2001
From: Anton Blanchard <[email protected]>
Date: Tue, 11 Nov 2014 09:12:28 +1100
Subject: powerpc: Fix bad NULL pointer check in udbg_uart_getc_poll()
From: Anton Blanchard <[email protected]>
commit cd32e2dcc9de6c27ecbbfc0e2079fb64b42bad5f upstream.
We have some code in udbg_uart_getc_poll() that tries to protect
against a NULL udbg_uart_in, but gets it all wrong.
Found with the LLVM static analyzer (scan-build).
Fixes: 309257484cc1 ("powerpc: Cleanup udbg_16550 and add support for LPC
PIO-only UARTs")
Signed-off-by: Anton Blanchard <[email protected]>
[mpe: Add some newlines for readability while we're here]
Signed-off-by: Michael Ellerman <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/powerpc/kernel/udbg_16550.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/arch/powerpc/kernel/udbg_16550.c
+++ b/arch/powerpc/kernel/udbg_16550.c
@@ -69,8 +69,12 @@ static void udbg_uart_putc(char c)
static int udbg_uart_getc_poll(void)
{
- if (!udbg_uart_in || !(udbg_uart_in(UART_LSR) & LSR_DR))
+ if (!udbg_uart_in)
+ return -1;
+
+ if (!(udbg_uart_in(UART_LSR) & LSR_DR))
return udbg_uart_in(UART_RBR);
+
return -1;
}
Patches currently in stable-queue which might be from [email protected] are
queue-3.18/powerpc-secondary-cpus-must-set-cpu_callin_map-after-setting-active-and-online.patch
queue-3.18/powerpc-fix-bad-null-pointer-check-in-udbg_uart_getc_poll.patch
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