From 74609f4536f2b8fd6a48381bbbe3cd37da20a527 Mon Sep 17 00:00:00 2001 From: Tony Breeds Date: Tue, 26 Jun 2007 09:50:32 +1000 Subject: [POWERPC] Fix VDSO gettimeofday() when called with NULL struct timeval Consider the prototype for gettimeofday(): int gettimofday(struct timeval *tv, struct timezone *tz); Although it is valid to call with /either/ tv or tz being NULL, and the C version of sys_gettimeofday() supports this, the current version of gettimeofday() in the VDSO will SEGV if called with a NULL tv. This adds a check for tv being NULL so that it doesn't SEGV. Signed-off-by: Tony Breeds Acked-by: Benjamin Herrenschmidt Signed-off-by: Paul Mackerras --- arch/powerpc/kernel/vdso32/gettimeofday.S | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'arch/powerpc/kernel/vdso32') diff --git a/arch/powerpc/kernel/vdso32/gettimeofday.S b/arch/powerpc/kernel/vdso32/gettimeofday.S index 05909f754307..72ca26df457e 100644 --- a/arch/powerpc/kernel/vdso32/gettimeofday.S +++ b/arch/powerpc/kernel/vdso32/gettimeofday.S @@ -32,6 +32,8 @@ V_FUNCTION_BEGIN(__kernel_gettimeofday) mr r11,r4 /* r11 saves tz */ bl __get_datapage@local /* get data page */ mr r9, r3 /* datapage ptr in r9 */ + cmplwi r10,0 /* check if tv is NULL */ + beq 3f bl __do_get_xsec@local /* get xsec from tb & kernel */ bne- 2f /* out of line -> do syscall */ @@ -50,7 +52,7 @@ V_FUNCTION_BEGIN(__kernel_gettimeofday) mulhwu r5,r5,r6 stw r5,TVAL32_TV_USEC(r10) - cmpli cr0,r11,0 /* check if tz is NULL */ +3: cmplwi r11,0 /* check if tz is NULL */ beq 1f lwz r4,CFG_TZ_MINUTEWEST(r9)/* fill tz */ lwz r5,CFG_TZ_DSTTIME(r9) -- cgit v1.2.3-58-ga151