From 41fad6503c1e5259e65d4f14110a5decb7653b02 Mon Sep 17 00:00:00 2001 From: Mateusz Guzik Date: Sat, 2 Sep 2023 14:27:33 +0000 Subject: [PATCH] vfs cache: fix a hang when bumping vnode limit too high Overflow in cache_changesize would make the value flip to 0 and stay there as 0 << 1 does not do anything. Note callers limit the outcome to something below u_int. Also note there entire vnode handling thing both in vfs layer as a whole and this file can't decide whether to long, u_long or u_int. (cherry picked from commit 32988c1499f8698b41e15ed40a46d271e757bba3) --- sys/kern/vfs_cache.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/sys/kern/vfs_cache.c b/sys/kern/vfs_cache.c index 92c926a16af..5b0cd64146a 100644 --- a/sys/kern/vfs_cache.c +++ b/sys/kern/vfs_cache.c @@ -2597,10 +2597,10 @@ cache_enter_time_flags(struct vnode *dvp, struct vnode *vp, struct componentname cache_enter_time(dvp, vp, cnp, tsp, dtsp); } -static u_int -cache_roundup_2(u_int val) +static u_long +cache_roundup_2(u_long val) { - u_int res; + u_long res; for (res = 1; res <= val; res <<= 1) continue; @@ -2616,7 +2616,7 @@ nchinittbl(u_long elements, u_long *hashmask) hashsize = cache_roundup_2(elements) / 2; - hashtbl = malloc((u_long)hashsize * sizeof(*hashtbl), M_VFSCACHE, M_WAITOK); + hashtbl = malloc(hashsize * sizeof(*hashtbl), M_VFSCACHE, M_WAITOK); for (i = 0; i < hashsize; i++) CK_SLIST_INIT(&hashtbl[i]); *hashmask = hashsize - 1; @@ -2762,7 +2762,7 @@ cache_changesize(u_long newmaxvnodes) struct namecache *ncp; uint32_t hash; u_long newncsize; - int i; + u_long i; newncsize = newmaxvnodes * ncsizefactor; newmaxvnodes = cache_roundup_2(newmaxvnodes * 2);