From: Paolo 'Blaisorblade' Giarrusso Date: Thu, 14 Jul 2005 07:33:34 +0000 (-0700) Subject: [PATCH] uml: fix lvalue for gcc4 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=bcb01b8a67476e6f748086e626df8424cc27036d;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git [PATCH] uml: fix lvalue for gcc4 Russell King This construct is refused by GCC 4, so here's the (corrected) fix. Thanks to Russell for noticing a stupid mistake I did when first sending this. As he noted, the code is largely suboptimal however it currently works, and will be fixed shortly. Just read the access_ok check on fp which is NULL, or the pointer arithmetic below which should be done with a cast to void*: frame = (struct rt_sigframe __user *) round_down(stack_top - sizeof(struct rt_sigframe), 16) - 8; The code shows clearly that has been taken from arch/x86_64/kernel/signal.c:setup_rt_frame(), maybe in a bit of a hurry. Signed-off-by: Paolo 'Blaisorblade' Giarrusso Cc: Jeff Dike Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/arch/um/sys-x86_64/signal.c b/arch/um/sys-x86_64/signal.c index 73a7926f7370..8fdaed06c10d 100644 --- a/arch/um/sys-x86_64/signal.c +++ b/arch/um/sys-x86_64/signal.c @@ -168,7 +168,7 @@ int setup_signal_stack_si(unsigned long stack_top, int sig, frame = (struct rt_sigframe __user *) round_down(stack_top - sizeof(struct rt_sigframe), 16) - 8; - ((unsigned char *) frame) -= 128; + frame = (struct rt_sigframe *) ((unsigned long) frame - 128); if (!access_ok(VERIFY_WRITE, fp, sizeof(struct _fpstate))) goto out;