The patch below does not apply to the 6.1-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-6.1.y git checkout FETCH_HEAD git cherry-pick -x cd7eb8f83fcf258f71e293f7fc52a70be8ed0128 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024051335-aversion-endearing-7ab9@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..

Possible dependencies:

cd7eb8f83fcf ("mm/slab: make __free(kfree) accept error pointers") a67d74a4b163 ("mm/slab: Add __free() support for kvfree") 54da6a092431 ("locking: Introduce __cleanup() based infrastructure")

thanks,

greg k-h

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

From cd7eb8f83fcf258f71e293f7fc52a70be8ed0128 Mon Sep 17 00:00:00 2001 From: Dan Carpenter dan.carpenter@linaro.org Date: Sun, 28 Apr 2024 17:26:44 +0300 Subject: [PATCH] mm/slab: make __free(kfree) accept error pointers

Currently, if an automatically freed allocation is an error pointer that will lead to a crash. An example of this is in wm831x_gpio_dbg_show().

171 char *label __free(kfree) = gpiochip_dup_line_label(chip, i); 172 if (IS_ERR(label)) { 173 dev_err(wm831x->dev, "Failed to duplicate label\n"); 174 continue; 175 }

The auto clean up function should check for error pointers as well, otherwise we're going to keep hitting issues like this.

Fixes: 54da6a092431 ("locking: Introduce __cleanup() based infrastructure") Cc: stable@vger.kernel.org Signed-off-by: Dan Carpenter dan.carpenter@linaro.org Acked-by: David Rientjes rientjes@google.com Signed-off-by: Vlastimil Babka vbabka@suse.cz

diff --git a/include/linux/slab.h b/include/linux/slab.h index e53cbfa18325..739b21262507 100644 --- a/include/linux/slab.h +++ b/include/linux/slab.h @@ -266,7 +266,7 @@ void kfree(const void *objp); void kfree_sensitive(const void *objp); size_t __ksize(const void *objp);

-DEFINE_FREE(kfree, void *, if (_T) kfree(_T)) +DEFINE_FREE(kfree, void *, if (!IS_ERR_OR_NULL(_T)) kfree(_T))

/** * ksize - Report actual allocation size of associated object @@ -792,7 +792,7 @@ static inline __alloc_size(1, 2) void *kvcalloc(size_t n, size_t size, gfp_t fla extern void *kvrealloc(const void *p, size_t oldsize, size_t newsize, gfp_t flags) __realloc_size(3); extern void kvfree(const void *addr); -DEFINE_FREE(kvfree, void *, if (_T) kvfree(_T)) +DEFINE_FREE(kvfree, void *, if (!IS_ERR_OR_NULL(_T)) kvfree(_T))

extern void kvfree_sensitive(const void *addr, size_t len);