Patch "module/decompress: use kvmalloc() consistently" has been added to the 6.6-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    module/decompress: use kvmalloc() consistently

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     module-decompress-use-kvmalloc-consistently.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit a193933edaf55a7326529dade630915da0e61bba
Author: Andrea Righi <andrea.righi@xxxxxxxxxxxxx>
Date:   Thu Nov 2 09:19:14 2023 +0100

    module/decompress: use kvmalloc() consistently
    
    [ Upstream commit 17fc8084aa8f9d5235f252fc3978db657dd77e92 ]
    
    We consistently switched from kmalloc() to vmalloc() in module
    decompression to prevent potential memory allocation failures with large
    modules, however vmalloc() is not as memory-efficient and fast as
    kmalloc().
    
    Since we don't know in general the size of the workspace required by the
    decompression algorithm, it is more reasonable to use kvmalloc()
    consistently, also considering that we don't have special memory
    requirements here.
    
    Suggested-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
    Tested-by: Andrea Righi <andrea.righi@xxxxxxxxxxxxx>
    Signed-off-by: Andrea Righi <andrea.righi@xxxxxxxxxxxxx>
    Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/kernel/module/decompress.c b/kernel/module/decompress.c
index 4156d59be4408..474e68f0f0634 100644
--- a/kernel/module/decompress.c
+++ b/kernel/module/decompress.c
@@ -100,7 +100,7 @@ static ssize_t module_gzip_decompress(struct load_info *info,
 	s.next_in = buf + gzip_hdr_len;
 	s.avail_in = size - gzip_hdr_len;
 
-	s.workspace = vmalloc(zlib_inflate_workspacesize());
+	s.workspace = kvmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
 	if (!s.workspace)
 		return -ENOMEM;
 
@@ -138,7 +138,7 @@ static ssize_t module_gzip_decompress(struct load_info *info,
 out_inflate_end:
 	zlib_inflateEnd(&s);
 out:
-	vfree(s.workspace);
+	kvfree(s.workspace);
 	return retval;
 }
 #elif defined(CONFIG_MODULE_COMPRESS_XZ)
@@ -241,7 +241,7 @@ static ssize_t module_zstd_decompress(struct load_info *info,
 	}
 
 	wksp_size = zstd_dstream_workspace_bound(header.windowSize);
-	wksp = vmalloc(wksp_size);
+	wksp = kvmalloc(wksp_size, GFP_KERNEL);
 	if (!wksp) {
 		retval = -ENOMEM;
 		goto out;
@@ -284,7 +284,7 @@ static ssize_t module_zstd_decompress(struct load_info *info,
 	retval = new_size;
 
  out:
-	vfree(wksp);
+	kvfree(wksp);
 	return retval;
 }
 #else