/* * linux/lib/kasprintf.c * * Copyright (C) 1991, 1992 Linus Torvalds */ #include #include #include #include #include /* Simplified asprintf. */ char *kvasprintf(gfp_t gfp, const char *fmt, va_list ap) { unsigned int first, second; char *p; va_list aq; va_copy(aq, ap); first = vsnprintf(NULL, 0, fmt, aq); va_end(aq); p = kmalloc_track_caller(first+1, gfp); if (!p) return NULL; second = vsnprintf(p, first+1, fmt, ap); WARN(first != second, "different return values (%u and %u) from vsnprintf(\"%s\", ...)", first, second, fmt); return p; } EXPORT_SYMBOL(kvasprintf); /* * If fmt contains no % (or is exactly %s), use kstrdup_const. If fmt * (or the sole vararg) points to rodata, we will then save a memory * allocation and string copy. In any case, the return value should be * freed using kfree_const(). */ const char *kvasprintf_const(gfp_t gfp, const char *fmt, va_list ap) { if (!strchr(fmt, '%')) return kstrdup_const(fmt, gfp); if (!strcmp(fmt, "%s")) return kstrdup_const(va_arg(ap, const char*), gfp); return kvasprintf(gfp, fmt, ap); } EXPORT_SYMBOL(kvasprintf_const); char *kasprintf(gfp_t gfp, const char *fmt, ...) { va_list ap; char *p; va_start(ap, fmt); p = kvasprintf(gfp, fmt, ap); va_end(ap); return p; } EXPORT_SYMBOL(kasprintf); net-next plumbingsTobias Klauser
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authorDan Carpenter <dan.carpenter@oracle.com>2017-01-30 10:55:04 +0100
committerDavid S. Miller <davem@davemloft.net>2017-01-30 16:37:55 -0500
commitcdaf25dfc058ee6f7a7b2e2353de00fa288c0cd4 (patch)
treea45096fd9e8aaeea2eac1f1999a3d17dfeb0d02b /net/bluetooth/hci_debugfs.c
parent1930b60352e7e195f55b27cde15d2a8f43342a8b (diff)
smc: some potential use after free bugs
Say we got really unlucky and these failed on the last iteration, then it could lead to a use after free bug. Fixes: cd6851f30386 ("smc: remote memory buffers (RMBs)") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/bluetooth/hci_debugfs.c')