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author | Alex Shi <alex.shi@linaro.org> | 2018-03-20 02:25:07 +0000 |
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committer | Alex Shi <alex.shi@linaro.org> | 2018-03-20 02:25:07 +0000 |
commit | 031f431679b03ba7e791dd051fc13f51f806fcd7 (patch) | |
tree | 9018f8a4a6c04feaf0180cae915dfe804913ce34 /mm/util.c | |
parent | f7901365aa48b20b25f8402e0fd1eea4ac6c55e7 (diff) | |
parent | 91db57e54eb9be1560454d6a370d67847b05735f (diff) |
Merge remote-tracking branch 'rt-stable/v4.4-rt' into linux-linaro-lsk-v4.4-rtlsk-v4.4-18.03-rt
Diffstat (limited to 'mm/util.c')
-rw-r--r-- | mm/util.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/mm/util.c b/mm/util.c index d5259b62f8d7..818bbae84721 100644 --- a/mm/util.c +++ b/mm/util.c @@ -80,6 +80,8 @@ EXPORT_SYMBOL(kstrdup_const); * @s: the string to duplicate * @max: read at most @max chars from @s * @gfp: the GFP mask used in the kmalloc() call when allocating memory + * + * Note: Use kmemdup_nul() instead if the size is known exactly. */ char *kstrndup(const char *s, size_t max, gfp_t gfp) { @@ -118,6 +120,28 @@ void *kmemdup(const void *src, size_t len, gfp_t gfp) EXPORT_SYMBOL(kmemdup); /** + * kmemdup_nul - Create a NUL-terminated string from unterminated data + * @s: The data to stringify + * @len: The size of the data + * @gfp: the GFP mask used in the kmalloc() call when allocating memory + */ +char *kmemdup_nul(const char *s, size_t len, gfp_t gfp) +{ + char *buf; + + if (!s) + return NULL; + + buf = kmalloc_track_caller(len + 1, gfp); + if (buf) { + memcpy(buf, s, len); + buf[len] = '\0'; + } + return buf; +} +EXPORT_SYMBOL(kmemdup_nul); + +/** * memdup_user - duplicate memory region from user space * * @src: source address in user space |