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authorJakub Kicinski <kuba@kernel.org>2020-07-10 03:42:44 +0300
committerDavid S. Miller <davem@davemloft.net>2020-07-10 23:54:00 +0300
commita2b992c828f7651db369ba8f0eb0818d70232636 (patch)
treef66e1c6eeb40d7acf38ad802e80df4efdde2e2f3 /include/linux/debugfs.h
parent8fb49c0109f47e4a25e8ba36abd8381afbfa7a08 (diff)
downloadlinux-a2b992c828f7651db369ba8f0eb0818d70232636.tar.xz
debugfs: make sure we can remove u32_array files cleanly
debugfs_create_u32_array() allocates a small structure to wrap the data and size information about the array. If users ever try to remove the file this leads to a leak since nothing ever frees this wrapper. That said there are no upstream users of debugfs_create_u32_array() that'd remove a u32 array file (we only have one u32 array user in CMA), so there is no real bug here. Make callers pass a wrapper they allocated. This way the lifetime management of the wrapper is on the caller, and we can avoid the potential leak in debugfs. CC: Chucheng Luo <luochucheng@vivo.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/debugfs.h')
-rw-r--r--include/linux/debugfs.h12
1 files changed, 9 insertions, 3 deletions
diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h
index 63cb3606dea7..851dd1f9a8a5 100644
--- a/include/linux/debugfs.h
+++ b/include/linux/debugfs.h
@@ -38,6 +38,11 @@ struct debugfs_regset32 {
struct device *dev; /* Optional device for Runtime PM */
};
+struct debugfs_u32_array {
+ u32 *array;
+ u32 n_elements;
+};
+
extern struct dentry *arch_debugfs_dir;
#define DEFINE_DEBUGFS_ATTRIBUTE(__fops, __get, __set, __fmt) \
@@ -136,7 +141,8 @@ void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
int nregs, void __iomem *base, char *prefix);
void debugfs_create_u32_array(const char *name, umode_t mode,
- struct dentry *parent, u32 *array, u32 elements);
+ struct dentry *parent,
+ struct debugfs_u32_array *array);
struct dentry *debugfs_create_devm_seqfile(struct device *dev, const char *name,
struct dentry *parent,
@@ -316,8 +322,8 @@ static inline bool debugfs_initialized(void)
}
static inline void debugfs_create_u32_array(const char *name, umode_t mode,
- struct dentry *parent, u32 *array,
- u32 elements)
+ struct dentry *parent,
+ struct debugfs_u32_array *array)
{
}