linux-kernel - [PATCH v2] smb/client: Fix logically dead code

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Message-Id: <20241007152334.11780-1-advaitdhamorikar@gmail.com>
Date: Mon,  7 Oct 2024 20:53:34 +0530
From: Advait Dhamorikar <advaitdhamorikar@...il.com>
To: Steve French <sfrench@...ba.org>,
	Paulo Alcantara <pc@...guebit.com>,
	Ronnie Sahlberg <ronniesahlberg@...il.com>,
	Shyam Prasad N <sprasad@...rosoft.com>,
	Tom Talpey <tom@...pey.com>,
	Bharath SM <bharathsm@...rosoft.com>,
	David Howells <dhowells@...hat.com>,
	Enzo Matsumiya <ematsumiya@...e.de>
Cc: linux-cifs@...r.kernel.org,
	samba-technical@...ts.samba.org,
	linux-kernel@...r.kernel.org,
	skhan@...uxfoundation.org,
	anupnewsmail@...il.com,
	smfrench@...il.com,
	Advait Dhamorikar <advaitdhamorikar@...il.com>
Subject: [PATCH v2] smb/client: Fix logically dead code

The if condition in collect_sample: can never be satisfied
because of a logical contradiction. The indicated dead code
may have performed some action; that action will never occur.

Fixes: 94ae8c3fee94 ("smb: client: compress: LZ77 code improvements cleanup")
Signed-off-by: Advait Dhamorikar <advaitdhamorikar@...il.com>
---
v1->v2: update short log and changelog

 fs/smb/client/compress.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/fs/smb/client/compress.c b/fs/smb/client/compress.c
index 63b5a55b7a57..766b4de13da7 100644
--- a/fs/smb/client/compress.c
+++ b/fs/smb/client/compress.c
@@ -166,7 +166,6 @@ static int collect_sample(const struct iov_iter *iter, ssize_t max, u8 *sample)
 	loff_t start = iter->xarray_start + iter->iov_offset;
 	pgoff_t last, index = start / PAGE_SIZE;
 	size_t len, off, foff;
-	ssize_t ret = 0;
 	void *p;
 	int s = 0;
 
@@ -193,9 +192,6 @@ static int collect_sample(const struct iov_iter *iter, ssize_t max, u8 *sample)
 				memcpy(&sample[s], p, len2);
 				kunmap_local(p);
 
-				if (ret < 0)
-					return ret;
-
 				s += len2;
 
 				if (len2 < SZ_2K || s >= max - SZ_2K)
-- 
2.34.1