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authorTony Breeds <tony@bakeyournoodle.com>2007-06-26 09:50:32 +1000
committerPaul Mackerras <paulus@samba.org>2007-06-26 14:41:19 +1000
commit74609f4536f2b8fd6a48381bbbe3cd37da20a527 (patch)
treef73c0abf05df85497b0323290e6cfff948a7fadd /arch/powerpc/kernel/vdso64
parentca74c013441200b162f6a384b23b833d1865a9e8 (diff)
[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.S7
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/vdso64/gettimeofday.S b/arch/powerpc/kernel/vdso64/gettimeofday.S
index 40ffd9b6cef..2d7a5104c66 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)