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[RESEND,V3] lib: 842: Improve error handling in sw842_compress()

Message ID 20250114141203.1421-1-tanyaagarwal25699@gmail.com (mailing list archive)
State Accepted
Delegated to: Herbert Xu
Headers show
Series [RESEND,V3] lib: 842: Improve error handling in sw842_compress() | expand

Commit Message

Tanya Agarwal Jan. 14, 2025, 2:12 p.m. UTC
From: Tanya Agarwal <tanyaagarwal25699@gmail.com>

The static code analysis tool "Coverity Scan" pointed the following
implementation details out for further development considerations:
CID 1309755: Unused value
In sw842_compress: A value assigned to a variable is never used. (CWE-563)
returned_value: Assigning value from add_repeat_template(p, repeat_count)
to ret here, but that stored value is overwritten before it can be used.

Conclusion:
Add error handling for the return value from an add_repeat_template()
call.

Fixes: 2da572c959dd ("lib: add software 842 compression/decompression")
Signed-off-by: Tanya Agarwal <tanyaagarwal25699@gmail.com>
---
V3: update title and reorganize commit description
V2: add Fixes tag and reword commit description

Coverity Link:
https://scan5.scan.coverity.com/#/project-view/63683/10063?selectedIssue=1309755

 lib/842/842_compress.c | 2 ++
 1 file changed, 2 insertions(+)

Comments

Herbert Xu Feb. 9, 2025, 10:21 a.m. UTC | #1
On Tue, Jan 14, 2025 at 07:42:04PM +0530, Tanya Agarwal wrote:
> From: Tanya Agarwal <tanyaagarwal25699@gmail.com>
> 
> The static code analysis tool "Coverity Scan" pointed the following
> implementation details out for further development considerations:
> CID 1309755: Unused value
> In sw842_compress: A value assigned to a variable is never used. (CWE-563)
> returned_value: Assigning value from add_repeat_template(p, repeat_count)
> to ret here, but that stored value is overwritten before it can be used.
> 
> Conclusion:
> Add error handling for the return value from an add_repeat_template()
> call.
> 
> Fixes: 2da572c959dd ("lib: add software 842 compression/decompression")
> Signed-off-by: Tanya Agarwal <tanyaagarwal25699@gmail.com>
> ---
> V3: update title and reorganize commit description
> V2: add Fixes tag and reword commit description
> 
> Coverity Link:
> https://scan5.scan.coverity.com/#/project-view/63683/10063?selectedIssue=1309755
> 
>  lib/842/842_compress.c | 2 ++
>  1 file changed, 2 insertions(+)

Patch applied.  Thanks.
diff mbox series

Patch

diff --git a/lib/842/842_compress.c b/lib/842/842_compress.c
index c02baa4168e1..055356508d97 100644
--- a/lib/842/842_compress.c
+++ b/lib/842/842_compress.c
@@ -532,6 +532,8 @@  int sw842_compress(const u8 *in, unsigned int ilen,
 		}
 		if (repeat_count) {
 			ret = add_repeat_template(p, repeat_count);
+			if (ret)
+				return ret;
 			repeat_count = 0;
 			if (next == last) /* reached max repeat bits */
 				goto repeat;