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| author | Max Krummenacher <max.krummenacher@toradex.com> | 2018-03-13 11:32:58 +0100 |
|---|---|---|
| committer | Max Krummenacher <max.krummenacher@toradex.com> | 2018-03-13 11:32:58 +0100 |
| commit | 6fb9f3c8a4992f67dcb3ce413df2e22e96b2d400 (patch) | |
| tree | 6e3071b2f179a62b027669ac2a238383293bf941 /fs/select.c | |
| parent | a126a5e5dc2fcc5cb36af14c89b440cc8e3bab30 (diff) | |
| parent | 8b5ab55d254f36e89b1b53aeac7223d2d102483e (diff) | |
Merge tag 'v4.4.121' into toradex_vf_4.4-nextColibri-VF_LXDE-Image_2.8b2.97-20180331
This is the 4.4.121 stable release
Diffstat (limited to 'fs/select.c')
| -rw-r--r-- | fs/select.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/fs/select.c b/fs/select.c index 015547330e88..f4dd55fc638c 100644 --- a/fs/select.c +++ b/fs/select.c @@ -29,6 +29,7 @@ #include <linux/sched/rt.h> #include <linux/freezer.h> #include <net/busy_poll.h> +#include <linux/vmalloc.h> #include <asm/uaccess.h> @@ -550,7 +551,7 @@ int core_sys_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set_bits fds; void *bits; int ret, max_fds; - unsigned int size; + size_t size, alloc_size; struct fdtable *fdt; /* Allocate small arguments on the stack to save memory and be faster */ long stack_fds[SELECT_STACK_ALLOC/sizeof(long)]; @@ -577,7 +578,14 @@ int core_sys_select(int n, fd_set __user *inp, fd_set __user *outp, if (size > sizeof(stack_fds) / 6) { /* Not enough space in on-stack array; must use kmalloc */ ret = -ENOMEM; - bits = kmalloc(6 * size, GFP_KERNEL); + if (size > (SIZE_MAX / 6)) + goto out_nofds; + + alloc_size = 6 * size; + bits = kmalloc(alloc_size, GFP_KERNEL|__GFP_NOWARN); + if (!bits && alloc_size > PAGE_SIZE) + bits = vmalloc(alloc_size); + if (!bits) goto out_nofds; } @@ -614,7 +622,7 @@ int core_sys_select(int n, fd_set __user *inp, fd_set __user *outp, out: if (bits != stack_fds) - kfree(bits); + kvfree(bits); out_nofds: return ret; } |