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sysctl: fix min/max handling in __do_proc_doulongvec_minmax() 

When proc_doulongvec_minmax() is used with an array of longs, and no
min/max check requested (.extra1 or .extra2 being NULL), we dereference a
NULL pointer for the second element of the array.

Noticed while doing some changes in network stack for the "16TB problem"

Fix is to not change min & max pointers in __do_proc_doulongvec_minmax(),
so that all elements of the vector share an unique min/max limit, like
proc_dointvec_minmax().

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Americo Wang <xiyou.wangcong@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Eric Dumazet 2010-10-07 12:59:29 -07:00 committed by Linus Torvalds
parent aaac7d9e0a
commit 27b3d80a7b
1 changed files with 1 additions and 1 deletions
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2
kernel/sysctl.c
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@ -2485,7 +2485,7 @@ static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int
kbuf[left] = 0;
}
for (; left && vleft--; i++, min++, max++, first=0) {
for (; left && vleft--; i++, first = 0) {
unsigned long val;
if (write) {