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| author | Kees Cook <keescook@chromium.org> | 2022-05-18 13:52:23 -0700 |
|---|---|---|
| committer | Yury Norov <yury.norov@gmail.com> | 2022-06-03 06:52:58 -0700 |
| commit | 0dfe54071d7c828a02917b595456bfde1afdddc9 (patch) | |
| tree | b77c04b230db5c1f8e04d468ba9637427337b815 /lib/nodemask.c | |
| parent | 005f17007f47495dbbb659aa5db7e581065d16e7 (diff) | |
| download | lwn-0dfe54071d7c828a02917b595456bfde1afdddc9.tar.gz lwn-0dfe54071d7c828a02917b595456bfde1afdddc9.zip | |
nodemask: Fix return values to be unsigned
The nodemask routines had mixed return values that provided potentially
signed return values that could never happen. This was leading to the
compiler getting confusing about the range of possible return values
(it was thinking things could be negative where they could not be). Fix
all the nodemask routines that should be returning unsigned
(or bool) values. Silences:
mm/swapfile.c: In function ‘setup_swap_info’:
mm/swapfile.c:2291:47: error: array subscript -1 is below array bounds of ‘struct plist_node[]’ [-Werror=array-bounds]
2291 | p->avail_lists[i].prio = 1;
| ~~~~~~~~~~~~~~^~~
In file included from mm/swapfile.c:16:
./include/linux/swap.h:292:27: note: while referencing ‘avail_lists’
292 | struct plist_node avail_lists[]; /*
| ^~~~~~~~~~~
Reported-by: Christophe de Dinechin <dinechin@redhat.com>
Link: https://lore.kernel.org/lkml/20220414150855.2407137-3-dinechin@redhat.com/
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Yury Norov <yury.norov@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
Diffstat (limited to 'lib/nodemask.c')
| -rw-r--r-- | lib/nodemask.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/nodemask.c b/lib/nodemask.c index 3aa454c54c0d..e22647f5181b 100644 --- a/lib/nodemask.c +++ b/lib/nodemask.c @@ -3,9 +3,9 @@ #include <linux/module.h> #include <linux/random.h> -int __next_node_in(int node, const nodemask_t *srcp) +unsigned int __next_node_in(int node, const nodemask_t *srcp) { - int ret = __next_node(node, srcp); + unsigned int ret = __next_node(node, srcp); if (ret == MAX_NUMNODES) ret = __first_node(srcp); |