linux-kernel - [PATCH] udf: initialize newblock to 0

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Date:   Fri, 30 Dec 2022 12:53:41 -0500
From:   Tom Rix <trix@...hat.com>
To:     jack@...e.com, nathan@...nel.org, ndesaulniers@...gle.com
Cc:     linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        Tom Rix <trix@...hat.com>
Subject: [PATCH] udf: initialize newblock to 0

The clang build reports this error
fs/udf/inode.c:805:6: error: variable 'newblock' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
        if (*err < 0)
            ^~~~~~~~
newblock is never set before error handling jump.
Initialize newblock to 0 and remove redundant settings.

Fixes: d8b39db5fab8 ("udf: Handle error when adding extent to a file")
Signed-off-by: Tom Rix <trix@...hat.com>
---
 fs/udf/inode.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 4a912e2edcec..31965c3798f2 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -604,7 +604,7 @@ static sector_t inode_getblk(struct inode *inode, sector_t block,
 	struct kernel_lb_addr eloc, tmpeloc;
 	int c = 1;
 	loff_t lbcount = 0, b_off = 0;
-	udf_pblk_t newblocknum, newblock;
+	udf_pblk_t newblocknum, newblock = 0;
 	sector_t offset = 0;
 	int8_t etype;
 	struct udf_inode_info *iinfo = UDF_I(inode);
@@ -710,7 +710,6 @@ static sector_t inode_getblk(struct inode *inode, sector_t block,
 		ret = udf_do_extend_file(inode, &prev_epos, laarr, hole_len);
 		if (ret < 0) {
 			*err = ret;
-			newblock = 0;
 			goto out_free;
 		}
 		c = 0;
@@ -775,7 +774,6 @@ static sector_t inode_getblk(struct inode *inode, sector_t block,
 				goal, err);
 		if (!newblocknum) {
 			*err = -ENOSPC;
-			newblock = 0;
 			goto out_free;
 		}
 		if (isBeyondEOF)
-- 
2.27.0