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authorakpm@osdl.org <akpm@osdl.org>2005-05-01 08:58:35 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-01 08:58:35 -0700
commitf021e9210185b46e41ec3a0e78ec1621e168eacb (patch)
tree5661ced2f5c69f737dcf7673db2ef6e852003d6d /mm
parent69aa3f71580990f39e387d96ed1001d2f5fb04b1 (diff)
[PATCH] generic_file_buffered_write fixes
Anton Altaparmakov <aia21@cam.ac.uk> points out: - It calls fault_in_pages_readable() which is completely bogus if @nr_segs > 1. It needs to be replaced by a to be written "fault_in_pages_readable_iovec()". - It increments @buf even in the iovec case thus @buf can point to random memory really quickly (in the iovec case) and then it calls fault_in_pages_readable() on this random memory. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/filemap.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index 93595c327bbd..9b74674e36ad 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1949,7 +1949,7 @@ generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,
buf = iov->iov_base + written;
else {
filemap_set_next_iovec(&cur_iov, &iov_base, written);
- buf = iov->iov_base + iov_base;
+ buf = cur_iov->iov_base + iov_base;
}
do {
@@ -2007,9 +2007,11 @@ generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,
count -= status;
pos += status;
buf += status;
- if (unlikely(nr_segs > 1))
+ if (unlikely(nr_segs > 1)) {
filemap_set_next_iovec(&cur_iov,
&iov_base, status);
+ buf = cur_iov->iov_base + iov_base;
+ }
}
}
if (unlikely(copied != bytes))

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