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sol2-unwind.h (sparc64_is_sighandler): Check that the purported sigacthandler address isn't null before dereferencing it.

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* config/sparc/sol2-unwind.h (sparc64_is_sighandler): Check that the
	purported sigacthandler address isn't null before dereferencing it.
	(sparc_is_sighandler): Likewise.

From-SVN: r183020
This commit is contained in:
Eric Botcazou 2012-01-09 18:20:55 +00:00 committed by Eric Botcazou
parent fabe41e40f
commit 3d137660a5
2 changed files with 10 additions and 6 deletions
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6
libgcc/ChangeLog
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@ -1,3 +1,9 @@
2012-01-09 Eric Botcazou <ebotcazou@adacore.com>
* config/sparc/sol2-unwind.h (sparc64_is_sighandler): Check that the
purported sigacthandler address isn't null before dereferencing it.
(sparc_is_sighandler): Likewise.
2012-01-09 Eric Botcazou <ebotcazou@adacore.com>
PR ada/41929

10
libgcc/config/sparc/sol2-unwind.h
View File

@ -124,10 +124,9 @@ sparc64_is_sighandler (unsigned int *pc, void *cfa, int *nframes)
/* This matches the call_user_handler pattern for Solaris 10.
There are 2 cases so we look for the return address of the
caller's caller frame in order to do more pattern matching. */
unsigned int sah_pattern
= *(unsigned int *)(*(unsigned long *)(cfa + 176 + 15*8) - 4);
unsigned long sah_address = *(unsigned long *)(cfa + 176 + 15*8);
if (sah_pattern == 0x92100019)
if (sah_address && *(unsigned int *)(sah_address - 4) == 0x92100019)
/* This is the same setup as for Solaris 9, see below. */
*nframes = 3;
else
@ -302,10 +301,9 @@ sparc_is_sighandler (unsigned int *pc, void *cfa, int *nframes)
/* This matches the call_user_handler pattern for Solaris 10.
There are 2 cases so we look for the return address of the
caller's caller frame in order to do more pattern matching. */
unsigned int sah_pattern
= *(unsigned int *)(*(unsigned int *)(cfa + 96 + 15*4) - 4);
unsigned int sah_address = *(unsigned int *)(cfa + 96 + 15*4);
if (sah_pattern == 0x92100019)
if (sah_address && *(unsigned int *)(sah_address - 4) == 0x92100019)
/* This is the same setup as for Solaris 9, see below. */
*nframes = 3;
else