FAILED: patch "[PATCH] qed: fix double free in qed_cxt_tables_alloc()" failed to apply to 5.10-stable tree

FAILED: patch "[PATCH] qed: fix double free in qed_cxt_tables_alloc()" failed to apply to 5.10-stable tree

[gregkh]

The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x 2bccfb8476ca5f3548afbd623dc7a6980d4e77de
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026052809-snowfall-thermos-6a66@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 2bccfb8476ca5f3548afbd623dc7a6980d4e77de Mon Sep 17 00:00:00 2001
From: Dawei Feng <dawei.feng@seu.edu.cn>
Date: Wed, 20 May 2026 15:03:23 +0800
Subject: [PATCH] qed: fix double free in qed_cxt_tables_alloc()

If one of the later PF or VF CID bitmap allocations fails,
qed_cid_map_alloc() jumps to cid_map_fail and frees the previously
allocated CID bitmaps before returning an error. qed_cxt_tables_alloc()
then calls qed_cxt_mngr_free(), which invokes qed_cid_map_free()
again.

Fix this by setting each CID bitmap pointer to NULL after bitmap_free()
to avoid double free.

The bug was first flagged by an experimental analysis tool we are
developing for kernel memory-management bugs while analyzing
v6.13-rc1. The tool is still under development and is not yet publicly
available. Manual inspection confirms that the bug is still
present in v7.1-rc3.

Runtime reproduction was not attempted because exercising the failing
allocation path requires device-specific setup.

Fixes: fe56b9e6a8d9 ("qed: Add module with basic common support")
Cc: stable@vger.kernel.org
Signed-off-by: Zilin Guan <zilin@seu.edu.cn>
Signed-off-by: Dawei Feng <dawei.feng@seu.edu.cn>
Link: https://patch.msgid.link/20260520070323.2762379-1-dawei.feng@seu.edu.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/qlogic/qed/qed_cxt.c b/drivers/net/ethernet/qlogic/qed/qed_cxt.c
index 9861daa82d9e..b70262e70baf 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_cxt.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_cxt.c
@@ -1036,11 +1036,13 @@ static void qed_cid_map_free(struct qed_hwfn *p_hwfn)
 
 	for (type = 0; type < MAX_CONN_TYPES; type++) {
 		bitmap_free(p_mngr->acquired[type].cid_map);
+		p_mngr->acquired[type].cid_map = NULL;
 		p_mngr->acquired[type].max_count = 0;
 		p_mngr->acquired[type].start_cid = 0;
 
 		for (vf = 0; vf < MAX_NUM_VFS; vf++) {
 			bitmap_free(p_mngr->acquired_vf[type][vf].cid_map);
+			p_mngr->acquired_vf[type][vf].cid_map = NULL;
 			p_mngr->acquired_vf[type][vf].max_count = 0;
 			p_mngr->acquired_vf[type][vf].start_cid = 0;
 		}

[PATCH 5.10.y 1/2] qed: Use the bitmap API to simplify some functions

[Sasha Levin]

From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>

[ Upstream commit 5e6c7ccd3ea4b25dd6b4b0363859913f315deacb ]

'cid_map' is a bitmap. So use 'bitmap_zalloc()' to simplify code,
improve the semantic and avoid some open-coded arithmetic in allocator
arguments.

Also change the corresponding 'kfree()' into 'bitmap_free()' to keep
consistency.

Also change some 'memset()' into 'bitmap_zero()' to keep consistency. This
is also much less verbose.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: 2bccfb8476ca ("qed: fix double free in qed_cxt_tables_alloc()")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/qlogic/qed/qed_cxt.c | 24 +++++------------------
 1 file changed, 5 insertions(+), 19 deletions(-)

diff --git a/drivers/net/ethernet/qlogic/qed/qed_cxt.c b/drivers/net/ethernet/qlogic/qed/qed_cxt.c
index 1c3737921b6cf..8fc8f428266a9 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_cxt.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_cxt.c
@@ -1037,12 +1037,12 @@ static void qed_cid_map_free(struct qed_hwfn *p_hwfn)
 	u32 type, vf;
 
 	for (type = 0; type < MAX_CONN_TYPES; type++) {
-		kfree(p_mngr->acquired[type].cid_map);
+		bitmap_free(p_mngr->acquired[type].cid_map);
 		p_mngr->acquired[type].max_count = 0;
 		p_mngr->acquired[type].start_cid = 0;
 
 		for (vf = 0; vf < MAX_NUM_VFS; vf++) {
-			kfree(p_mngr->acquired_vf[type][vf].cid_map);
+			bitmap_free(p_mngr->acquired_vf[type][vf].cid_map);
 			p_mngr->acquired_vf[type][vf].max_count = 0;
 			p_mngr->acquired_vf[type][vf].start_cid = 0;
 		}
@@ -1055,15 +1055,10 @@ qed_cid_map_alloc_single(struct qed_hwfn *p_hwfn,
 			 u32 cid_start,
 			 u32 cid_count, struct qed_cid_acquired_map *p_map)
 {
-	u32 size;
-
 	if (!cid_count)
 		return 0;
 
-	size = DIV_ROUND_UP(cid_count,
-			    sizeof(unsigned long) * BITS_PER_BYTE) *
-	       sizeof(unsigned long);
-	p_map->cid_map = kzalloc(size, GFP_KERNEL);
+	p_map->cid_map = bitmap_zalloc(cid_count, GFP_KERNEL);
 	if (!p_map->cid_map)
 		return -ENOMEM;
 
@@ -1217,7 +1212,6 @@ void qed_cxt_mngr_setup(struct qed_hwfn *p_hwfn)
 	struct qed_cid_acquired_map *p_map;
 	struct qed_conn_type_cfg *p_cfg;
 	int type;
-	u32 len;
 
 	/* Reset acquired cids */
 	for (type = 0; type < MAX_CONN_TYPES; type++) {
@@ -1226,11 +1220,7 @@ void qed_cxt_mngr_setup(struct qed_hwfn *p_hwfn)
 		p_cfg = &p_mngr->conn_cfg[type];
 		if (p_cfg->cid_count) {
 			p_map = &p_mngr->acquired[type];
-			len = DIV_ROUND_UP(p_map->max_count,
-					   sizeof(unsigned long) *
-					   BITS_PER_BYTE) *
-			      sizeof(unsigned long);
-			memset(p_map->cid_map, 0, len);
+			bitmap_zero(p_map->cid_map, p_map->max_count);
 		}
 
 		if (!p_cfg->cids_per_vf)
@@ -1238,11 +1228,7 @@ void qed_cxt_mngr_setup(struct qed_hwfn *p_hwfn)
 
 		for (vf = 0; vf < MAX_NUM_VFS; vf++) {
 			p_map = &p_mngr->acquired_vf[type][vf];
-			len = DIV_ROUND_UP(p_map->max_count,
-					   sizeof(unsigned long) *
-					   BITS_PER_BYTE) *
-			      sizeof(unsigned long);
-			memset(p_map->cid_map, 0, len);
+			bitmap_zero(p_map->cid_map, p_map->max_count);
 		}
 	}
 }
-- 
2.53.0

[PATCH 5.10.y 2/2] qed: fix double free in qed_cxt_tables_alloc()

[Sasha Levin]

From: Dawei Feng <dawei.feng@seu.edu.cn>

[ Upstream commit 2bccfb8476ca5f3548afbd623dc7a6980d4e77de ]

If one of the later PF or VF CID bitmap allocations fails,
qed_cid_map_alloc() jumps to cid_map_fail and frees the previously
allocated CID bitmaps before returning an error. qed_cxt_tables_alloc()
then calls qed_cxt_mngr_free(), which invokes qed_cid_map_free()
again.

Fix this by setting each CID bitmap pointer to NULL after bitmap_free()
to avoid double free.

The bug was first flagged by an experimental analysis tool we are
developing for kernel memory-management bugs while analyzing
v6.13-rc1. The tool is still under development and is not yet publicly
available. Manual inspection confirms that the bug is still
present in v7.1-rc3.

Runtime reproduction was not attempted because exercising the failing
allocation path requires device-specific setup.

Fixes: fe56b9e6a8d9 ("qed: Add module with basic common support")
Cc: stable@vger.kernel.org
Signed-off-by: Zilin Guan <zilin@seu.edu.cn>
Signed-off-by: Dawei Feng <dawei.feng@seu.edu.cn>
Link: https://patch.msgid.link/20260520070323.2762379-1-dawei.feng@seu.edu.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/qlogic/qed/qed_cxt.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/qlogic/qed/qed_cxt.c b/drivers/net/ethernet/qlogic/qed/qed_cxt.c
index 8fc8f428266a9..2585d36b94f2f 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_cxt.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_cxt.c
@@ -1038,11 +1038,13 @@ static void qed_cid_map_free(struct qed_hwfn *p_hwfn)
 
 	for (type = 0; type < MAX_CONN_TYPES; type++) {
 		bitmap_free(p_mngr->acquired[type].cid_map);
+		p_mngr->acquired[type].cid_map = NULL;
 		p_mngr->acquired[type].max_count = 0;
 		p_mngr->acquired[type].start_cid = 0;
 
 		for (vf = 0; vf < MAX_NUM_VFS; vf++) {
 			bitmap_free(p_mngr->acquired_vf[type][vf].cid_map);
+			p_mngr->acquired_vf[type][vf].cid_map = NULL;
 			p_mngr->acquired_vf[type][vf].max_count = 0;
 			p_mngr->acquired_vf[type][vf].start_cid = 0;
 		}
-- 
2.53.0