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05 April 2024, 19:05:47 UTC
Revision 877f919e192a09e77962a13d7165783027dee5fd authored by Chunyu Hu on 09 June 2018, 19:51:24 UTC, committed by Al Viro on 28 June 2018, 00:44:38 UTC 
proc: add proc_seq_release
 
kmemleak reported some memory leak on reading proc files. After adding
some debug lines, find that proc_seq_fops is using seq_release as
release handler, which won't handle the free of 'private' field of
seq_file, while in fact the open handler proc_seq_open could create
the private data with __seq_open_private when state_size is greater
than zero. So after reading files created with proc_create_seq_private,
such as /proc/timer_list and /proc/vmallocinfo, the private mem of a
seq_file is not freed. Fix it by adding the paired proc_seq_release
as the default release handler of proc_seq_ops instead of seq_release.

Fixes: 44414d82cfe0 ("proc: introduce proc_create_seq_private")
Reviewed-by: Christoph Hellwig <hch@lst.de>
CC: Christoph Hellwig <hch@lst.de>
Signed-off-by: Chunyu Hu <chuhu@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
1 parent ce397d2
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Tip revision: 877f919e192a09e77962a13d7165783027dee5fd authored by Chunyu Hu on 09 June 2018, 19:51:24 UTC
proc: add proc_seq_release
Tip revision: 877f919
.get_maintainer.ignore 
Christoph Hellwig <hch@lst.de>
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