The 'state->im' value will always be non-zero after
the 'while' statement, so the check can be removed.

Found by InfoTeCS on behalf of Linux Verification Center
(linuxtesting.org) with SVACE.

Signed-off-by: Gavrilov Ilia <Ilia.Gavrilov@infotecs.ru>
---
Repost according to https://lore.kernel.org/all/fea6db56-3a01-b7c8-b800-a6c885e99feb@kernel.org/
 net/ipv4/igmp.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index 418e5fb58fd3..76c3ea75b8dd 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -2944,8 +2944,6 @@ static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_l
 				continue;
 			state->im = rcu_dereference(state->idev->mc_list);
 		}
-		if (!state->im)
-			break;
 		spin_lock_bh(&state->im->lock);
 		psf = state->im->sources;
 	}
-- 
2.39.2

Hello:

This patch was applied to netdev/net-next.git (main)
by Paolo Abeni <pabeni@redhat.com>:

On Tue, 12 Sep 2023 08:42:34 +0000 you wrote:
> The 'state->im' value will always be non-zero after
> the 'while' statement, so the check can be removed.
> 
> Found by InfoTeCS on behalf of Linux Verification Center
> (linuxtesting.org) with SVACE.
> 
> Signed-off-by: Gavrilov Ilia <Ilia.Gavrilov@infotecs.ru>
> 
> [...]

Here is the summary with links:
  - [net-next] ipv4: igmp: Remove redundant comparison in igmp_mcf_get_next()
    https://git.kernel.org/netdev/net-next/c/a613ed1afd96

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html

On 9/12/23 2:42 AM, Gavrilov Ilia wrote:
> The 'state->im' value will always be non-zero after
> the 'while' statement, so the check can be removed.
> 
> Found by InfoTeCS on behalf of Linux Verification Center
> (linuxtesting.org) with SVACE.
> 
> Signed-off-by: Gavrilov Ilia <Ilia.Gavrilov@infotecs.ru>
> ---
> Repost according to https://lore.kernel.org/all/fea6db56-3a01-b7c8-b800-a6c885e99feb@kernel.org/
>  net/ipv4/igmp.c | 2 --
>  1 file changed, 2 deletions(-)
> 

Reviewed-by: David Ahern <dsahern@kernel.org>