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authorErick Archer <erick.archer@gmx.com>2024-01-15 21:16:58 +0300
committerSteven Rostedt (Google) <rostedt@goodmis.org>2024-01-17 01:52:33 +0300
commit1057066009c4325bb1d8430c9274894d0860e7c3 (patch)
tree57f27c262f8104ee6ecd7fcafb3f74dfdcd84736 /fs/tracefs
parent852e46e239ee6db3cd220614cf8bce96e79227c2 (diff)
downloadlinux-1057066009c4325bb1d8430c9274894d0860e7c3.tar.xz
eventfs: Use kcalloc() instead of kzalloc()
As noted in the "Deprecated Interfaces, Language Features, Attributes, and Conventions" documentation [1], size calculations (especially multiplication) should not be performed in memory allocator (or similar) function arguments due to the risk of them overflowing. This could lead to values wrapping around and a smaller allocation being made than the caller was expecting. Using those allocations could lead to linear overflows of heap memory and other misbehaviors. So, use the purpose specific kcalloc() function instead of the argument size * count in the kzalloc() function. [1] https://www.kernel.org/doc/html/next/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments Link: https://lore.kernel.org/linux-trace-kernel/20240115181658.4562-1-erick.archer@gmx.com Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Mark Rutland <mark.rutland@arm.com> Link: https://github.com/KSPP/linux/issues/162 Signed-off-by: Erick Archer <erick.archer@gmx.com> Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'fs/tracefs')
-rw-r--r--fs/tracefs/event_inode.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/tracefs/event_inode.c b/fs/tracefs/event_inode.c
index 10580d6b5012..6795fda2af19 100644
--- a/fs/tracefs/event_inode.c
+++ b/fs/tracefs/event_inode.c
@@ -97,7 +97,7 @@ static int eventfs_set_attr(struct mnt_idmap *idmap, struct dentry *dentry,
/* Preallocate the children mode array if necessary */
if (!(dentry->d_inode->i_mode & S_IFDIR)) {
if (!ei->entry_attrs) {
- ei->entry_attrs = kzalloc(sizeof(*ei->entry_attrs) * ei->nr_entries,
+ ei->entry_attrs = kcalloc(ei->nr_entries, sizeof(*ei->entry_attrs),
GFP_NOFS);
if (!ei->entry_attrs) {
ret = -ENOMEM;
@@ -874,7 +874,7 @@ struct eventfs_inode *eventfs_create_dir(const char *name, struct eventfs_inode
}
if (size) {
- ei->d_children = kzalloc(sizeof(*ei->d_children) * size, GFP_KERNEL);
+ ei->d_children = kcalloc(size, sizeof(*ei->d_children), GFP_KERNEL);
if (!ei->d_children) {
kfree_const(ei->name);
kfree(ei);
@@ -941,7 +941,7 @@ struct eventfs_inode *eventfs_create_events_dir(const char *name, struct dentry
goto fail;
if (size) {
- ei->d_children = kzalloc(sizeof(*ei->d_children) * size, GFP_KERNEL);
+ ei->d_children = kcalloc(size, sizeof(*ei->d_children), GFP_KERNEL);
if (!ei->d_children)
goto fail;
}