From 74910e6c7dc7471b286a883c1a7af70483ffd2ba Mon Sep 17 00:00:00 2001 From: Andrew Morton Date: Fri, 17 Feb 2006 13:52:58 -0800 Subject: [PATCH] [PATCH] select: time comparison fixes I got all of these backwards. We want to return min(input timeout, new timeout) to userspace to prevent increasing the time-remaining value. Thanks to Ernst Herzberg for reporting and diagnosing. Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/compat.c | 6 +++--- fs/select.c | 6 +++--- 2 files changed, 6 insertions(+), 6 deletions(-) diff --git a/fs/compat.c b/fs/compat.c index a2ba78bdf7f7..5333c7d7427f 100644 --- a/fs/compat.c +++ b/fs/compat.c @@ -1757,7 +1757,7 @@ asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp, goto sticky; rtv.tv_usec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ)); rtv.tv_sec = timeout; - if (compat_timeval_compare(&rtv, &tv) < 0) + if (compat_timeval_compare(&rtv, &tv) >= 0) rtv = tv; if (copy_to_user(tvp, &rtv, sizeof(rtv))) { sticky: @@ -1834,7 +1834,7 @@ asmlinkage long compat_sys_pselect7(int n, compat_ulong_t __user *inp, rts.tv_sec++; rts.tv_nsec -= NSEC_PER_SEC; } - if (compat_timespec_compare(&rts, &ts) < 0) + if (compat_timespec_compare(&rts, &ts) >= 0) rts = ts; copy_to_user(tsp, &rts, sizeof(rts)); } @@ -1934,7 +1934,7 @@ asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds, rts.tv_nsec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ)) * 1000; rts.tv_sec = timeout; - if (compat_timespec_compare(&rts, &ts) < 0) + if (compat_timespec_compare(&rts, &ts) >= 0) rts = ts; if (copy_to_user(tsp, &rts, sizeof(rts))) { sticky: diff --git a/fs/select.c b/fs/select.c index 6ce68a9c8976..1815a57d2255 100644 --- a/fs/select.c +++ b/fs/select.c @@ -404,7 +404,7 @@ asmlinkage long sys_select(int n, fd_set __user *inp, fd_set __user *outp, goto sticky; rtv.tv_usec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ)); rtv.tv_sec = timeout; - if (timeval_compare(&rtv, &tv) < 0) + if (timeval_compare(&rtv, &tv) >= 0) rtv = tv; if (copy_to_user(tvp, &rtv, sizeof(rtv))) { sticky: @@ -471,7 +471,7 @@ asmlinkage long sys_pselect7(int n, fd_set __user *inp, fd_set __user *outp, rts.tv_nsec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ)) * 1000; rts.tv_sec = timeout; - if (timespec_compare(&rts, &ts) < 0) + if (timespec_compare(&rts, &ts) >= 0) rts = ts; if (copy_to_user(tsp, &rts, sizeof(rts))) { sticky: @@ -775,7 +775,7 @@ asmlinkage long sys_ppoll(struct pollfd __user *ufds, unsigned int nfds, rts.tv_nsec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ)) * 1000; rts.tv_sec = timeout; - if (timespec_compare(&rts, &ts) < 0) + if (timespec_compare(&rts, &ts) >= 0) rts = ts; if (copy_to_user(tsp, &rts, sizeof(rts))) { sticky: -- 2.20.1