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eventfs: Use ERR_CAST() in eventfs_create_events_dir()

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When building with clang and CONFIG_RANDSTRUCT_FULL=y, there is an error
due to a cast in eventfs_create_events_dir():

  fs/tracefs/event_inode.c:734:10: error: casting from randomized structure pointer type 'struct dentry *' to 'struct eventfs_inode *'
    734 |                 return (struct eventfs_inode *)dentry;
        |                        ^
  1 error generated.

Use the ERR_CAST() function to resolve the error, as it was designed for
this exact situation (casting an error pointer to another type).

Link: https://lore.kernel.org/linux-trace-kernel/20231018-ftrace-fix-clang-randstruct-v1-1-338cb214abfb@kernel.org

Closes: https://github.com/ClangBuiltLinux/linux/issues/1947
Fixes: 5790b1fb3d ("eventfs: Remove eventfs_file and just use eventfs_inode")
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Nathan Chancellor 2023-10-18 11:10:31 -07:00 committed by Steven Rostedt (Google)
parent 5ddd8baa48
commit b8a555dc31
1 changed files with 1 additions and 1 deletions
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2
fs/tracefs/event_inode.c
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@ -731,7 +731,7 @@ struct eventfs_inode *eventfs_create_events_dir(const char *name, struct dentry
return NULL;
if (IS_ERR(dentry))
return (struct eventfs_inode *)dentry;
return ERR_CAST(dentry);
ei = kzalloc(sizeof(*ei), GFP_KERNEL);
if (!ei)