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authorFrederic Barrat <fbarrat@linux.vnet.ibm.com>2017-06-06 11:43:41 +0200
committerMichael Ellerman <mpe@ellerman.id.au>2017-06-08 12:42:31 +0200
commitcec422c11caeeccae709e9942058b6b644ce434c (patch)
treeb1d9aeb6a5653feabb6380c34eb7bde22a4a80a7 /drivers/misc/cxl
parentpowerpc/perf: Fix Power9 test_adder fields (diff)
downloadlinux-cec422c11caeeccae709e9942058b6b644ce434c.tar.xz
linux-cec422c11caeeccae709e9942058b6b644ce434c.zip
cxl: Fix error path on bad ioctl
Fix error path if we can't copy user structure on CXL_IOCTL_START_WORK ioctl. We shouldn't unlock the context status mutex as it was not locked (yet). Fixes: 0712dc7e73e5 ("cxl: Fix issues when unmapping contexts") Cc: stable@vger.kernel.org # v3.19+ Signed-off-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com> Reviewed-by: Vaibhav Jain <vaibhav@linux.vnet.ibm.com> Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/misc/cxl')
-rw-r--r--drivers/misc/cxl/file.c7
1 files changed, 2 insertions, 5 deletions
diff --git a/drivers/misc/cxl/file.c b/drivers/misc/cxl/file.c
index 17b433f1ce23..0761271d68c5 100644
--- a/drivers/misc/cxl/file.c
+++ b/drivers/misc/cxl/file.c
@@ -159,11 +159,8 @@ static long afu_ioctl_start_work(struct cxl_context *ctx,
/* Do this outside the status_mutex to avoid a circular dependency with
* the locking in cxl_mmap_fault() */
- if (copy_from_user(&work, uwork,
- sizeof(struct cxl_ioctl_start_work))) {
- rc = -EFAULT;
- goto out;
- }
+ if (copy_from_user(&work, uwork, sizeof(work)))
+ return -EFAULT;
mutex_lock(&ctx->status_mutex);
if (ctx->status != OPENED) {