[PATCH] RDMA/uverbs: Make the code in ib_uverbs_cmd_verbs() less confusing

[PATCH] RDMA/uverbs: Make the code in ib_uverbs_cmd_verbs() less confusing

[Bart Van Assche]

This patch reduces the number of #ifdefs and also avoids that
smatch reports the following:

drivers/infiniband/core/uverbs_ioctl.c:276: ib_uverbs_cmd_verbs() warn: if statement not indented
drivers/infiniband/core/uverbs_ioctl.c:280: ib_uverbs_cmd_verbs() warn: possible memory leak of 'ctx'
drivers/infiniband/core/uverbs_ioctl.c:315: ib_uverbs_cmd_verbs() warn: if statement not indented

References: commit fac9658cabb9 ("IB/core: Add new ioctl interface")
Signed-off-by: Bart Van Assche <bart.vanassche-Sjgp3cTcYWE@public.gmane.org>
Acked-by: Matan Barak <matanb-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Cc: Yishai Hadas <yishaih-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
---
 drivers/infiniband/core/uverbs_ioctl.c | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/drivers/infiniband/core/uverbs_ioctl.c b/drivers/infiniband/core/uverbs_ioctl.c
index 5286ad57d903..71ff2644e053 100644
--- a/drivers/infiniband/core/uverbs_ioctl.c
+++ b/drivers/infiniband/core/uverbs_ioctl.c
@@ -241,9 +241,7 @@ static long ib_uverbs_cmd_verbs(struct ib_device *ib_dev,
 	struct uverbs_attr *curr_attr;
 	unsigned long *curr_bitmap;
 	size_t ctx_size;
-#ifdef UVERBS_OPTIMIZE_USING_STACK_SZ
 	uintptr_t data[UVERBS_OPTIMIZE_USING_STACK_SZ / sizeof(uintptr_t)];
-#endif
 
 	if (hdr->reserved)
 		return -EINVAL;
@@ -269,13 +267,10 @@ static long ib_uverbs_cmd_verbs(struct ib_device *ib_dev,
 			(method_spec->num_child_attrs / BITS_PER_LONG +
 			 method_spec->num_buckets);
 
-#ifdef UVERBS_OPTIMIZE_USING_STACK_SZ
 	if (ctx_size <= UVERBS_OPTIMIZE_USING_STACK_SZ)
 		ctx = (void *)data;
-
 	if (!ctx)
-#endif
-	ctx = kmalloc(ctx_size, GFP_KERNEL);
+		ctx = kmalloc(ctx_size, GFP_KERNEL);
 	if (!ctx)
 		return -ENOMEM;
 
@@ -311,10 +306,8 @@ static long ib_uverbs_cmd_verbs(struct ib_device *ib_dev,
 	err = uverbs_handle_method(buf, ctx->uattrs, hdr->num_attrs, ib_dev,
 				   file, method_spec, ctx->uverbs_attr_bundle);
 out:
-#ifdef UVERBS_OPTIMIZE_USING_STACK_SZ
-	if (ctx_size > UVERBS_OPTIMIZE_USING_STACK_SZ)
-#endif
-	kfree(ctx);
+	if (ctx != (void *)data)
+		kfree(ctx);
 	return err;
 }
 
-- 
2.14.2

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Re: [PATCH] RDMA/uverbs: Make the code in ib_uverbs_cmd_verbs() less confusing

[Doug Ledford]

On Mon, 2017-10-16 at 08:47 -0700, Bart Van Assche wrote:
> This patch reduces the number of #ifdefs and also avoids that
> smatch reports the following:
> 
> drivers/infiniband/core/uverbs_ioctl.c:276: ib_uverbs_cmd_verbs()
> warn: if statement not indented
> drivers/infiniband/core/uverbs_ioctl.c:280: ib_uverbs_cmd_verbs()
> warn: possible memory leak of 'ctx'
> drivers/infiniband/core/uverbs_ioctl.c:315: ib_uverbs_cmd_verbs()
> warn: if statement not indented
> 
> References: commit fac9658cabb9 ("IB/core: Add new ioctl interface")
> Signed-off-by: Bart Van Assche <bart.vanassche-Sjgp3cTcYWE@public.gmane.org>
> Acked-by: Matan Barak <matanb-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
> Cc: Yishai Hadas <yishaih-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>

Thanks, applied.

-- 
Doug Ledford <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
    GPG KeyID: B826A3330E572FDD
    Key fingerprint = AE6B 1BDA 122B 23B4 265B  1274 B826 A333 0E57 2FDD

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