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authorRichard Weinberger <richard@nod.at>2016-06-12 22:03:16 +0200
committerRichard Weinberger <richard@nod.at>2016-08-04 00:17:58 +0200
commit57a05d83b16710aff30510c33768df7ab17e0b4a (patch)
treeb8535f4cb6462564b41c8e8deedde84868991874 /arch/um/os-Linux
parent5609a3d309836d047eb60275db69d82d47268283 (diff)
downloadblackbird-obmc-linux-57a05d83b16710aff30510c33768df7ab17e0b4a.tar.gz
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um: Fix possible deadlock in sig_handler_common()
We are in atomic context and must not sleep. Sleeping here is possible since malloc() maps to kmalloc() with GFP_KERNEL. Cc: stable@vger.kernel.org Fixes: b6024b21 ("um: extend fpstate to _xstate to support YMM registers") Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/um/os-Linux')
-rw-r--r--arch/um/os-Linux/signal.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c
index 8acaf4e384c0..a86d7cc2c2d8 100644
--- a/arch/um/os-Linux/signal.c
+++ b/arch/um/os-Linux/signal.c
@@ -15,6 +15,7 @@
#include <kern_util.h>
#include <os.h>
#include <sysdep/mcontext.h>
+#include <um_malloc.h>
void (*sig_info[NSIG])(int, struct siginfo *, struct uml_pt_regs *) = {
[SIGTRAP] = relay_signal,
@@ -32,7 +33,7 @@ static void sig_handler_common(int sig, struct siginfo *si, mcontext_t *mc)
struct uml_pt_regs *r;
int save_errno = errno;
- r = malloc(sizeof(struct uml_pt_regs));
+ r = uml_kmalloc(sizeof(struct uml_pt_regs), UM_GFP_ATOMIC);
if (!r)
panic("out of memory");
@@ -91,7 +92,7 @@ static void timer_real_alarm_handler(mcontext_t *mc)
{
struct uml_pt_regs *regs;
- regs = malloc(sizeof(struct uml_pt_regs));
+ regs = uml_kmalloc(sizeof(struct uml_pt_regs), UM_GFP_ATOMIC);
if (!regs)
panic("out of memory");
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