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authorPrateek Sood <prsood@codeaurora.org>2020-08-20 22:57:50 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-08-28 11:32:07 +0200
commit4965b8cd1bc1ffb017e5c58e622da82b55e49414 (patch)
tree2fa2de314dd49a03d2decb96a0eceaa9b2685042 /drivers
parentLinux 5.9-rc2 (diff)
downloadlinux-4965b8cd1bc1ffb017e5c58e622da82b55e49414.tar.xz
linux-4965b8cd1bc1ffb017e5c58e622da82b55e49414.zip
firmware_loader: fix memory leak for paged buffer
vfree() is being called on paged buffer allocated using alloc_page() and mapped using vmap(). Freeing of pages in vfree() relies on nr_pages of struct vm_struct. vmap() does not update nr_pages. It can lead to memory leaks. Fixes: ddaf29fd9bb6 ("firmware: Free temporary page table after vmapping") Signed-off-by: Prateek Sood <prsood@codeaurora.org> Reviewed-by: Takashi Iwai <tiwai@suse.de> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/1597957070-27185-1-git-send-email-prsood@codeaurora.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/base/firmware_loader/firmware.h2
-rw-r--r--drivers/base/firmware_loader/main.c17
2 files changed, 13 insertions, 6 deletions
diff --git a/drivers/base/firmware_loader/firmware.h b/drivers/base/firmware_loader/firmware.h
index 933e2192fbe8..d08efc77cf16 100644
--- a/drivers/base/firmware_loader/firmware.h
+++ b/drivers/base/firmware_loader/firmware.h
@@ -142,10 +142,12 @@ int assign_fw(struct firmware *fw, struct device *device, u32 opt_flags);
void fw_free_paged_buf(struct fw_priv *fw_priv);
int fw_grow_paged_buf(struct fw_priv *fw_priv, int pages_needed);
int fw_map_paged_buf(struct fw_priv *fw_priv);
+bool fw_is_paged_buf(struct fw_priv *fw_priv);
#else
static inline void fw_free_paged_buf(struct fw_priv *fw_priv) {}
static inline int fw_grow_paged_buf(struct fw_priv *fw_priv, int pages_needed) { return -ENXIO; }
static inline int fw_map_paged_buf(struct fw_priv *fw_priv) { return -ENXIO; }
+static inline bool fw_is_paged_buf(struct fw_priv *fw_priv) { return false; }
#endif
#endif /* __FIRMWARE_LOADER_H */
diff --git a/drivers/base/firmware_loader/main.c b/drivers/base/firmware_loader/main.c
index 9da0c9d5f538..63b9714a0154 100644
--- a/drivers/base/firmware_loader/main.c
+++ b/drivers/base/firmware_loader/main.c
@@ -252,9 +252,11 @@ static void __free_fw_priv(struct kref *ref)
list_del(&fw_priv->list);
spin_unlock(&fwc->lock);
- fw_free_paged_buf(fw_priv); /* free leftover pages */
- if (!fw_priv->allocated_size)
+ if (fw_is_paged_buf(fw_priv))
+ fw_free_paged_buf(fw_priv);
+ else if (!fw_priv->allocated_size)
vfree(fw_priv->data);
+
kfree_const(fw_priv->fw_name);
kfree(fw_priv);
}
@@ -268,6 +270,11 @@ static void free_fw_priv(struct fw_priv *fw_priv)
}
#ifdef CONFIG_FW_LOADER_PAGED_BUF
+bool fw_is_paged_buf(struct fw_priv *fw_priv)
+{
+ return fw_priv->is_paged_buf;
+}
+
void fw_free_paged_buf(struct fw_priv *fw_priv)
{
int i;
@@ -275,6 +282,8 @@ void fw_free_paged_buf(struct fw_priv *fw_priv)
if (!fw_priv->pages)
return;
+ vunmap(fw_priv->data);
+
for (i = 0; i < fw_priv->nr_pages; i++)
__free_page(fw_priv->pages[i]);
kvfree(fw_priv->pages);
@@ -328,10 +337,6 @@ int fw_map_paged_buf(struct fw_priv *fw_priv)
if (!fw_priv->data)
return -ENOMEM;
- /* page table is no longer needed after mapping, let's free */
- kvfree(fw_priv->pages);
- fw_priv->pages = NULL;
-
return 0;
}
#endif