diff options
| author | Tony Breeds <tony@bakeyournoodle.com> | 2007-06-26 09:50:32 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2007-06-26 14:41:19 +1000 |
| commit | 74609f4536f2b8fd6a48381bbbe3cd37da20a527 (patch) | |
| tree | f73c0abf05df85497b0323290e6cfff948a7fadd /arch/powerpc/kernel/vdso64 | |
| parent | ca74c013441200b162f6a384b23b833d1865a9e8 (diff) | |
| download | lwn-74609f4536f2b8fd6a48381bbbe3cd37da20a527.tar.gz lwn-74609f4536f2b8fd6a48381bbbe3cd37da20a527.zip | |
[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/vdso64')
| -rw-r--r-- | arch/powerpc/kernel/vdso64/gettimeofday.S | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/vdso64/gettimeofday.S b/arch/powerpc/kernel/vdso64/gettimeofday.S index 40ffd9b6cef7..2d7a5104c666 100644 --- a/arch/powerpc/kernel/vdso64/gettimeofday.S +++ b/arch/powerpc/kernel/vdso64/gettimeofday.S @@ -1,5 +1,4 @@ - - /* +/* * Userland implementation of gettimeofday() for 64 bits processes in a * ppc64 kernel for use in the vDSO * @@ -32,6 +31,8 @@ V_FUNCTION_BEGIN(__kernel_gettimeofday) mr r11,r3 /* r11 holds tv */ mr r10,r4 /* r10 holds tz */ bl V_LOCAL_FUNC(__get_datapage) /* get data page */ + cmpldi r10,0 /* check if tv is NULL */ + beq 2f bl V_LOCAL_FUNC(__do_get_xsec) /* get xsec from tb & kernel */ lis r7,15 /* r7 = 1000000 = USEC_PER_SEC */ ori r7,r7,16960 @@ -43,8 +44,8 @@ V_FUNCTION_BEGIN(__kernel_gettimeofday) * XSEC_PER_SEC */ rldicl r0,r0,44,20 - cmpldi cr0,r10,0 /* check if tz is NULL */ std r0,TVAL64_TV_USEC(r11) /* store usec in tv */ +2: cmpldi r10,0 /* check if tz is NULL */ beq 1f lwz r4,CFG_TZ_MINUTEWEST(r3)/* fill tz */ lwz r5,CFG_TZ_DSTTIME(r3) |