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(parent: 38a618d) | patch
gfs2: Fix underflow in gfs2_page_mkwrite
authorAndreas Gruenbacher <agruenba@redhat.com>
Mon, 21 Jun 2021 20:28:50 +0000 (22:28 +0200)
committerAndreas Gruenbacher <agruenba@redhat.com>
Mon, 28 Jun 2021 12:13:38 +0000 (14:13 +0200)
commitd3c51c55cb9274dd43c156f1f26b5eb4d5f2d58c
tree8e94b737f7b6c5cc9ba014cfc7fa8cfa3a3ca1e6tree | snapshot
parent38a618dbf47f837f11df01052977dcaf31c5c2a8commit | diff
gfs2: Fix underflow in gfs2_page_mkwrite

On filesystems with a block size smaller than PAGE_SIZE and non-empty
files smaller then PAGE_SIZE, gfs2_page_mkwrite could end up allocating
excess blocks beyond the end of the file, similar to fallocate.  This
doesn't make sense; fix it.

Reported-by: Bob Peterson <rpeterso@redhat.com>
Fixes: 184b4e60853d ("gfs2: Fix end-of-file handling in gfs2_page_mkwrite")
Cc: stable@vger.kernel.org # v5.5+
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
fs/gfs2/file.c diff | blob | history
ep93xx device tree rework repo: git://git.maquefel.me/linux.git