From: Rafał Miłecki Date: Tue, 7 Jul 2015 21:21:49 +0000 (+0000) Subject: nvram: fix "Segmentation fault" caused by setting memory out of buffer X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=9f158499108eae39555bc65d1abfd86bd0c65533;p=librecmc%2Flibrecmc.git nvram: fix "Segmentation fault" caused by setting memory out of buffer Some MTD partitions with NVRAM have content starting in the middle. In such case offset is set and nvram_header returns pointer to the middle. It means we have to respect offset when calculating remaining space. By the way use real MTD partition size (nvram_part_size variable) as we may want to bump NVRAM_SPACE in the (very near) future. Signed-off-by: Rafał Miłecki SVN-Revision: 46251 --- diff --git a/package/utils/nvram/src/nvram.c b/package/utils/nvram/src/nvram.c index c4bcb1d4a6..c490597d4b 100644 --- a/package/utils/nvram/src/nvram.c +++ b/package/utils/nvram/src/nvram.c @@ -286,11 +286,11 @@ int nvram_commit(nvram_handle_t *h) /* Clear data area */ ptr = (char *) header + sizeof(nvram_header_t); - memset(ptr, 0xFF, NVRAM_SPACE - sizeof(nvram_header_t)); + memset(ptr, 0xFF, nvram_part_size - h->offset - sizeof(nvram_header_t)); memset(&tmp, 0, sizeof(nvram_header_t)); /* Leave space for a double NUL at the end */ - end = (char *) header + NVRAM_SPACE - 2; + end = (char *) header + nvram_part_size - h->offset - 2; /* Write out all tuples */ for (i = 0; i < NVRAM_ARRAYSIZE(h->nvram_hash); i++) {