diff options
| author | Tony Breeds <tony@bakeyournoodle.com> | 2007-06-26 03:50:32 +0400 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2007-06-26 08:41:19 +0400 |
| commit | 74609f4536f2b8fd6a48381bbbe3cd37da20a527 (patch) | |
| tree | f73c0abf05df85497b0323290e6cfff948a7fadd /arch/powerpc/kernel/vdso32 | |
| parent | ca74c013441200b162f6a384b23b833d1865a9e8 (diff) | |
| download | linux-74609f4536f2b8fd6a48381bbbe3cd37da20a527.tar.xz | |
[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 <tony@bakeyournoodle.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel/vdso32')
| -rw-r--r-- | arch/powerpc/kernel/vdso32/gettimeofday.S | 4 |
1 files changed, 3 insertions, 1 deletions
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) |